“Oki Iwagaki Haruka” (隠岐 いわがき春香) is a frozen, in-shell raw iwagaki (rock oyster) product whose product description gives the harvest area (place of origin) as Hobomi Bay in Ama Town, Oki, Shimane Prefecture (島根県隠岐海士町保々見湾). With frozen in-shell oysters, it’s natural to wonder how many are in the box, how to thaw them, and by when they should be eaten. In this article, we’ve organized the publicly available product information and review-site listings for Iwagaki Haruka, about 2kg (10-12 pieces), sold by Shimakaze Seikatsu (島風生活。楽天市場店) on Rakuten Ichiba, into five points: contents, storage and how to eat, ingredient labeling, suitability as a gift, and reviews. Its key features are 2kg (10-12 pieces) frozen in the shell, with cocktail sauce included.
At a Glance
Key points
- Frozen in-shell iwagaki, 2kg (small size × 10-12 pieces). The name is shown as “冷凍生いわがき(生食用)” (frozen raw iwagaki (for raw consumption)). Cocktail sauce (35g × 1 pack) is also included
- Stored frozen at -18°C or below, with a use-by date within 30 days of the shipping date stated
- Rakuten rating 4.69 (631 reviews). Viewed September 25, 2026
- The harvest area is Hobomi Bay, Ama Town, Oki, Shimane Prefecture, as stated in the product description
Watch out for
- For the thawing time, the sales page (LP) images give two different figures: “45分” (45 minutes) and “水に30分” (30 minutes in water)
- The reviews we read include comments that it tasted salty and that it takes up quite a lot of freezer space
Suits: People looking for frozen in-shell iwagaki whose name is labeled for raw consumption, and who want to open 10-12 of them from the shell at home
The comparison covers the 6 oyster products featured on Ochinity (as of October 22, 2026). Each value is as of the date its own article was researched and may differ from the current listing. The features are from the Rakuten Ichiba product page and the sales page (LP) images (viewed September 25, 2026). The rating is Rakuten’s display (viewed September 25, 2026) and does not necessarily reflect the current state of the product.
Compared with 6 Similar Oyster Products
Among the 6 oyster products featured on Ochinity (as of October 22, 2026). Each value is as of the date its own article was researched and may differ from the current listing. Ratings are Rakuten Ichiba’s display; values move more easily the fewer reviews there are, and they do not necessarily reflect the current condition of a product. The table is ordered by product name with this article first, and the order does not indicate superiority.
| Product | Total Amount (g) | Delivery Temperature | Rakuten Rating |
|---|---|---|---|
| Oki Iwagaki Haruka Rock Oysters, About 2kg — Contents, Shelf Life & Reviews (this article) | 2000 | Not confirmed | 4.69 (631 reviews, 2026-09-25) |
| Jumbo Hiroshima Oysters 1kg — Contents, Shelf Life & Reviews | 1000 | Frozen | 4.64 (19849 reviews, 2026-09-25) |
| Jumbo Hiroshima Oysters 2kg (For Cooking) — Contents, Shelf Life & Reviews | 2000 | Frozen | 4.68 (7230 reviews, 2026-10-05) |
| Hiroshima Steamed Oysters 850g — Contents, Shelf Life & Reviews | 1000 | Frozen | 4.77 (934 reviews, 2026-09-26) |
| Hiroshima Frozen Oysters 1kg (for Cooking) — Contents, Storage & Reviews | 1000 | Frozen | 4.83 (2883 reviews, 2026-10-07) |
| 松島牡蠣屋 Shell-On Oysters 2kg (Labeled for Raw Consumption, from Miyagi) — Contents, Shelf Life & Reviews | 2000 | Refrigerated | 4.49 (2846 reviews, 2026-10-21) |
Product names link to each product’s article.
- The total amount of 2000g is the same as Jumbo Hiroshima Oysters 2kg (For Cooking) — Contents, Shelf Life & Reviews and 松島牡蠣屋 Shell-On Oysters 2kg (Labeled for Raw Consumption, from Miyagi) — Contents, Shelf Life & Reviews among the 6 oyster products featured on Ochinity (as of October 22, 2026). The other 3 are 1000g
- Rakuten’s rating of 4.69 (631 reviews) is lower than the 4.83 of Hiroshima Frozen Oysters 1kg (for Cooking) — Contents, Storage & Reviews and the 4.77 of Hiroshima Steamed Oysters 850g — Contents, Shelf Life & Reviews, and higher than the 4.68 of Jumbo Hiroshima Oysters 2kg (For Cooking) — Contents, Shelf Life & Reviews, among the 6 oyster products featured on Ochinity (as of October 22, 2026). The 631 reviews are fewer than the other 5 products (934 to 19,849 reviews)
Basic Information
- Product Name
- [Direct from Oki Island] Iwagaki Haruka, Tabegoro Size, about 2kg, 10-12 pieces (【隠岐島直送】いわがき春香 食べごろサイズ 約2kg10～12個)
- Amount
- 2kg (small size × 10-12 pieces). The product description states that cocktail sauce (35g) is included
- Part
- In the shell (frozen whole)
- Storage
- Frozen at -18°C or below, as stated in the product description
- Best-Before Date
- For the iwagaki, the “use-by date” field states within 30 days of the shipping date
- Allergens
- Not confirmed
- Price
- Not listed here because it changes
- Shipping
- We could not find a statement of the delivery temperature range (Not confirmed). The sales page (LP) images state that it can be delivered at any time of year
- Noshi / Gift
- The Rakuten gift field shows nothing, while the sales page (LP) images state that wrapping, noshi (gift wrapping label), and gift cards are supported
This list transcribes what is stated on the product page. However, the “not confirmed” labels and any notes we add are our own.
The name of the iwagaki is stated as frozen raw iwagaki (for raw consumption), and the ingredients of the included cocktail sauce are also stated in the product description. We could not find allergen labeling on the product page. Oysters (kaki) are shellfish. If you have an allergy, please contact the seller before purchasing, or be sure to check the label on the product once it arrives (reference: Consumer Affairs Agency, Japan, “About Allergen Labeling”, viewed September 25, 2026).
See the transcribed details, sources and “not confirmed” items (16 items)
This list transcribes what is stated on the product page. However, the “not confirmed” labels and any notes we add are our own.
- Product Name
- [Direct from Oki Island] Iwagaki Haruka, Tabegoro Size, about 2kg, 10-12 pieces (【隠岐島直送】いわがき春香 食べごろサイズ 約2kg10～12個)Source: Rakuten Ichiba product page (viewed September 25, 2026)
- Type of Food
- Frozen raw iwagaki (for raw consumption) (冷凍生いわがき(生食用))Source: product description on the Rakuten Ichiba product page (viewed September 25, 2026)
- Amount
- 2kg (small size × 10-12 pieces). The product description also mentions an included cocktail sauce (35g). The sales page (LP) images list cocktail sauce (35g × 1 pack), an oyster knife, and work gloves as contents. We could not find a statement of how many servings it makesSource: product description on the Rakuten Ichiba product page and sales page (LP) images within the product page (viewed September 25, 2026)
- Part
- In the shell (frozen whole)Source: sales page (LP) images within the Rakuten Ichiba product page
- Storage Method
- Frozen at -18°C or below (both the iwagaki and the cocktail sauce)Source: product description on the Rakuten Ichiba product page
- Best-Before Date
- For the iwagaki, the “use-by date” field states within 30 days of the shipping date. For the cocktail sauce, the “best-before date” field states within 90 days of the dispatch dateSource: product description on the Rakuten Ichiba product page (viewed September 25, 2026)
- Ingredients and Allergens
- The name of the iwagaki is stated as frozen raw iwagaki (for raw consumption), and the place of origin (harvest area) as Hobomi Bay, Ama Town, Oki, Shimane Prefecture. The ingredients of the included cocktail sauce are stated as tomato ketchup, fresh lemon, horseradish, Tabasco, white pepper, salt / citric acid, V.C. We could not find allergen labeling for the iwagaki or the cocktail sauce on the product page (Not confirmed). Oysters (kaki) are shellfishSource: product description on the Rakuten Ichiba product page (viewed September 25, 2026)
- Country of Origin of Ingredients
- Harvest area: Hobomi Bay, Ama Town, Oki, Shimane Prefecture (島根県隠岐海士町保々見湾)Source: product description on the Rakuten Ichiba product page
- Place of Processing
- The “processor name” field in the product description lists Furusato Ama Co., Ltd. (株式会社ふるさと海士), 1524-1 Fukui, Ama Town, Oki District, Shimane PrefectureSource: product description on the Rakuten Ichiba product page
- State / How to Eat (Whether Heating Is Required)
- The name is shown as “冷凍生いわがき(生食用)” (frozen raw iwagaki (for raw consumption)). It is a frozen product, frozen whole in the shell, and the sales page describes a flow of thawing in water and then opening the shell to eat. We could not find the seller’s guidance on how to cook it by heating. We could not find a note of caution about raw consumption on the product page or in the sales page (LP) imagesSource: product description and sales page (LP) images on the Rakuten Ichiba product page (viewed September 25, 2026)
- Thawing Method
- In the sales page (LP) images, the heading of the thawing section gives 45 minutes, and the subheading of the same section gives 30 minutes in water, so two different times are stated. How long it keeps after thawing is Not confirmedSource: sales page (LP) images within the Rakuten Ichiba product page (viewed September 25, 2026)
- Delivery
- We could not find a statement of the delivery temperature range (whether it is a frozen delivery), so it is Not confirmed. The sales page (LP) images state that it can be delivered at any time of year. We could not find a guide to the time before dispatch on the product pageSource: sales page (LP) images within the Rakuten Ichiba product page (viewed September 25, 2026)
- Manufacturer
- Furusato Ama Co., Ltd. (株式会社ふるさと海士), 1524-1 Fukui, Ama Town, Oki District, Shimane Prefecture. For the iwagaki it is listed in the “processor name” field, and for the cocktail sauce in the “manufacturer” fieldSource: product description on the Rakuten Ichiba product page
- Noshi / Gift
- The gift field of the Rakuten Ichiba product page shows nothing about noshi, wrapping, or message cards. On the other hand, the sales page (LP) images state that wrapping and noshi are prepared and that names can be printed on the noshi, that gift cards are supported, and that nothing showing the price, such as a delivery slip, is included in the package, so the two displays do not agree. The types of noshi inscription and the kinds of packaging such as a decorative box are Not confirmedSource: Rakuten Ichiba product page (gift field) and sales page (LP) images within the product page (viewed September 25, 2026)
- Listing History (as Stated by the Shop)
- The sales page (LP) states, according to the shop, that the product was featured in a special section of the magazine Fujin Gaho (婦人画報), September 2020 issue. This feature dates from 2020 and is not the latestSource: sales page (LP) within the Rakuten Ichiba product page (viewed September 25, 2026)
- Shop
- Shimakaze Seikatsu (島風生活。楽天市場店) on Rakuten Ichiba
Prices are not listed here because they change. Please check the current price and stock availability at the link above.
What Public Reviews Say
Below is a summary of the ratings and reviews published on Rakuten Ichiba. The rating figures reflect the time we viewed the page and will change afterward. The rating on Rakuten customer reviews is 4.69 / 5 (631 reviews, viewed September 25, 2026).
What we read: about 30 reviews on page 1 of the “default” sort order (posted 2022 to September 2026, latest September 19, 2026). These are trends within what we read and may not reflect the product’s current condition.
What Reviewers Praise
Comments stand out saying that the meat was large and satisfying even at the Tabegoro Size, and that it was rich and creamy and did not seem frozen. Reviewers also frequently say the included knife and gloves and the instructions with photos made the shells easy to open, that the included cocktail sauce went well with them, and that they are repeat buyers.
Source: Rakuten customer reviews (viewed September 25, 2026; summarized)
What Reviewers Note
There are comments that it tasted salty (some say it stops being noticeable once rinsed), that thawing took a long time, such as about an hour in cold water, that it takes up quite a lot of freezer space, and that the price has gone up. There are also comments that 5 of 12 pieces were small, and that the knife and gloves were not included; to the latter, the shop replied that “not needed” had been selected when the order was placed.
Source: Rakuten customer reviews (viewed September 25, 2026; summarized)
Summary: Is This the One for You?
Why choose it: You want to prepare frozen in-shell iwagaki whose name is labeled for raw consumption, in 10-12 pieces. If that is your condition, this product fits (weak points: the sales page (LP) images give two different thawing times, “45分” (45 minutes) and “水に30分” (30 minutes in water)).
- The Rakuten rating is 4.69 / 5 (631 reviews). In the roughly 30 reviews we read, comments stood out saying that the meat was large even at the Tabegoro Size, that it was rich and creamy, and that the included knife and gloves made the shells easy to open
- It is stored frozen at -18°C or below, with a use-by date within 30 days of the shipping date stated
Other options: For shell-on oysters for raw consumption from Miyagi Prefecture, see 松島牡蠣屋 Shell-On Oysters 2kg (Labeled for Raw Consumption, from Miyagi) — Contents, Shelf Life & Reviews; for frozen shucked oysters for cooking, see Hiroshima Frozen Oysters 1kg (for Cooking) — Contents, Storage & Reviews.
This section is based on the Rakuten Ichiba product page and Rakuten customer reviews (viewed September 25, 2026). These are trends in the reviews we read and do not necessarily reflect the current state of the product.
Prices, stock, shipping fees, and delivery dates are subject to change. This article’s information-as-of date is September 25, 2026. Please be sure to check the listing at the link before purchasing.
This article contains affiliate links (advertising). Editorial Policy
This article organizes information published on various retail sites. Product details such as amount, storage method, and ingredients are subject to change, and this article reflects the content as of the information-as-of date.
Comments on taste or quality are summarized from third-party posts cited with their source, and are not Ochinity’s own evaluation. Our approach to writing articles is described in our Editorial Policy.
Information as of: September 25, 2026 / Sources: Rakuten Ichiba “Shimakaze Seikatsu” (島風生活。楽天市場店) product page and sales page (LP), Rakuten customer reviews, Consumer Affairs Agency “About Allergen Labeling” (Japan)
