This is itamochi (slab mochi) made with mochi rice (glutinous rice) grown in Japan, sold by 株式会社渡英商店 of Kamo City, Niigata Prefecture. The outlet mochi arrives as one slab of mochi (670g) in a vacuum pack. The surface is divided into 16 pieces, and you can break it apart by hand to use it. Based on the Rakuten Ichiba product page and reviews, we organized the amount, storage, ingredients, noshi (gift wrapping label) and reviews.
At a Glance
Key points
- One 670g slab of mochi, with the surface divided into 16 pieces. Each piece is a commercial-use size of about 6cm long × 4.5cm wide, so you can break off just the amount you need
- Heat-sterilized vacuum pack. The best-before date is 6 months from the manufacturing date. For outlet items, the shop says the time left on arrival will be shorter than 6 months
- The ingredients are paddy-grown mochi rice (grown in Japan) and glycine (an amino acid), two in all
- Rakuten rating 4.75 (2,676 reviews). Viewed November 4, 2026. There are many reviews, and 2,155 of them are 5★
Watch out for
- Some reviewers say each piece is on the small and thin side (about 12 of the 85 reviews we read). Because it is an outlet item, pieces with an uneven shape may arrive
- Storage is in the refrigerator, and the shop advises not to put it in the freezer
Suits: people who want to break off just the amount they need, and people who want thin mochi that heats through quickly
The features are from the Rakuten Ichiba product page (viewed November 4, 2026). The rating is as shown on Rakuten (viewed November 4, 2026) and may not reflect the product’s current condition.
Basic Information
- Product Name
- アウトレット餅（板餅・イタモチ）670g (outlet mochi, slab mochi, itamochi, 670g)
- Seller
- 株式会社 渡英商店 (Niigata Prefecture, Kamo City)
- Amount
- 670g (one slab, surface divided into 16 pieces)
- Best-Before Date
- 6 months from the manufacturing date (shorter by the time it arrives)
- Storage
- Store in the refrigerator. The shop advises not to use the freezer
- Ingredients
- Paddy-grown mochi rice (grown in Japan), glycine (an amino acid)
- Allergen Labeling
- Not confirmed
- Noshi / Gift
- Support for noshi and wrapping is Not confirmed
This list transcribes what is stated on the product page. However, the “Not confirmed” labels and any notes we add are our own.
There is no dedicated allergen labeling field on the product page. If you have an allergy, ask the seller before buying, or be sure to check the label on the product when it arrives (Reference: Consumer Affairs Agency, Japan, “About Allergen Labeling”, accessed November 4, 2026).
See the transcribed details, sources and “Not confirmed” items (15 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
- アウトレット餅（板餅・イタモチ）670g (outlet mochi, slab mochi, itamochi, 670g)The product name shown on the Rakuten page is a long string with many search keywords. Only the product-name part is shown here.
- Amount
- 670g. The product description says it is a commercial-use size in which the slab is divided into 16 pieces, and that each piece is about 6cm long × 4.5cm wide. The product images explain that the surface of one slab is divided into 16 and the back into 32, and that the thickness is about 12.5mm. The images also still carry an explanation of the old 680g size, but the current amount is 670g. The number of servings is not stated and is Not confirmedSource: product description and images on the Rakuten Ichiba product page (viewed November 4, 2026)
- Choices
- There is no size selection field. It is one kind: 670g (one slab)Source: Rakuten Ichiba product page (viewed November 4, 2026)
- Reason for the Outlet (Wakeari) Label
- “Wakeari” (a Japanese shopping label for items sold with a stated reason) applies here. The seller explains that these are pieces sorted out by 渡英商店’s own standard for uneven shape (waviness, a curved bottom, a difference in size between the left and right mochi, air bubbles inside, and so on). It also writes that more than 90% are at a level that could be used as regular products, and that the contents are the same as the regular product. The shop also says a regular product may arrive insteadSource: explanation in the images on the Rakuten Ichiba product page (the seller’s statement; viewed November 4, 2026)
- Storage Method
- The shop advises storing it away from direct sunlight, high temperatures and humidity, in as cool a place as possible. It writes that after opening, the mochi cracks when exposed to air, so you should put it in a nylon bag with a zipper or wrap it in plastic wrap, keep it in the refrigerator and eat it early. The shop advises not to store it in the freezerSource: product description on the Rakuten Ichiba product page (viewed November 4, 2026)
- Best-Before Date
- 6 months (counted from the manufacturing date). Because sorting and other work take place before shipping, the shop says the time left on arrival will be shorter than 6 months. It also writes that it will not become much shorter. The actual date is printed on the productSource: product description on the Rakuten Ichiba product page (viewed November 4, 2026)
- Ingredients
- Paddy-grown mochi rice (grown in Japan), glycine (an amino acid)Source: product description on the Rakuten Ichiba product page (viewed November 4, 2026)
- Allergen Labeling
- Not confirmed (no dedicated labeling field is found on the product page)
- Country of Origin of Ingredients
- It is grown in Japan. No prefecture name is found, and it is Not confirmedSource: product description on the Rakuten Ichiba product page
- Processing Location
- Niigata Prefecture (the seller is located in Kamo City, Niigata Prefecture). Whether the location of the manufacturing site is stated is Not confirmedSource: product description on the Rakuten Ichiba product page
- Condition / How to Eat (Cooking Required?)
- It is described as mochi in a heat-sterilized vacuum pack. The ways to eat it introduced include isobeyaki (grilled mochi wrapped in nori), kinako mochi (mochi with roasted soybean flour), Abekawa mochi, natto mochi, mochi gratin, fried mochi, oshiruko (sweet red bean soup with mochi) and boiled mochi. Whether cooking is needed and the cooking time are Not confirmedSource: product description and images on the Rakuten Ichiba product page (viewed November 4, 2026)
- Shipping
- It ships by Sagawa Express (佐川急便) Hikyaku Takuhaibin, and the product name does not specify chilled or frozen delivery. The shop says it ships within 2 business days of order confirmation, and you can specify the delivery date and timeSource: Rakuten Ichiba product page and shop notice (viewed November 4, 2026)
- Manufacturer
- It is written that 株式会社 渡英商店 (Kamo City, Niigata Prefecture) both makes and sells itSource: product description on the Rakuten Ichiba product page
- Noshi / Gift
- Support for noshi, wrapping and message cards is not found on the product page and is Not confirmedSource: Rakuten Ichiba product page (viewed November 4, 2026)
- Shop
- 越後の老舗白玉屋 わたえい (Rakuten Ichiba)
Prices are not stated here because they change. Please check the latest price and stock at the link above.
What Public Reviews Say
We organized the Rakuten Ichiba product reviews by viewpoint. The rating figures are as of the viewing date and change afterward. What follows are trends within what we read and may not reflect the product’s current condition.
| Site | Rating | Number of Reviews | Date Accessed |
|---|---|---|---|
| Rakuten customer reviews (product page) | 4.75 / 5 | 2,676 | November 4, 2026 |
Rating breakdown: 5★ 2,155 / 4★ 414 / 3★ 82 / 2★ 19 / 1★ 6 (as shown on Rakuten Ichiba, viewed November 4, 2026)
What we read: the first 60 reviews in Rakuten’s default order (posted November 2024 to October 2026, latest October 2026), all 6 reviews rated 1★ (posted 2010 to 2024) and all 19 reviews rated 2★ (posted 2009 to 2020), 85 in total. We did not read the 3★ reviews. Even the latest 1★ and 2★ posts are from October 2024, and most are old. These are trends within what we read and may not reflect the product’s current condition.
The counts below come from reading the text, are approximate, and do not include posts only about delivery or the shop’s service.
What Reviewers Praise
Taste and rice flavor (about 45 of 60)
About 45 of the 60 reviews in the default order say it tastes good, or has the flavor of rice or the aroma of mochi rice. Some posts also say it differs from the cut mochi sold in supermarkets (reviewer’s description).
Easy to break and easy to use (about 13)
About 13 of the 60 mention that it snaps by hand along the grooves, that you can cut just the amount you eat, or that it is thin and heats through easily. One description also says the rest can be wrapped in film for storage.
Stretches well, like freshly pounded mochi (about 7)
About 7 of the 60 say it stretches well or is like freshly pounded mochi.
Repeat purchases (about 23)
About 23 of the 60 say they bought it again or buy it every year. Many of these posts mention buying it to coincide with the New Year.
Source: Rakuten customer reviews (accessed November 4, 2026)
What Reviewers Note
Each piece is small or thin (about 2 of the 60; about 10 of the 25 rated 1★ or 2★)
About 2 of the 60 in the default order say it is small, or thin and not very filling; both go on to say they were satisfied with the taste. Among the 25 rated 1★ or 2★, about 10 said so. These were posted between 2010 and 2018.
How to check: the size and thickness of each piece are summarized in the “Amount” row of “Basic Information” in this article.
No different from ordinary mochi (about 6 of the 25 rated 1★ or 2★)
About 6 posts say it is no different from supermarket mochi, or that they did not find it especially tasty. These were posted between 2009 and 2024. Among the 60 in the default order, posts saying it is delicious were the majority.
Mold, cracking and drying (2 of the 25 rated 1★ or 2★; 1 of the 60)
Two posts from 2016 say mold appeared on an unopened pack, or that a cracked piece with mold on it was included. Among the 60 in the default order, 1 post says it dries out if left after opening.
How to check: the storage guidance is summarized in the “Storage Method” row of “Basic Information” in this article.
Source: Rakuten customer reviews (accessed November 4, 2026)
Summary: Is This the One for You?
Why choose it: you want to break off only the amount you need, and you want thin mochi that heats through quickly. If those two are your conditions, the outlet slab mochi with its surface divided into 16 pieces fits (weak point: each piece is on the small and thin side).
- One 670g slab of mochi with the surface divided into 16 pieces. In the reviews, about 13 of the 60 we read say it is easy to break by hand and easy to use
- Rakuten rating 4.75 / 5 (2,676 reviews). About 45 of the 60 we read mention the taste
- The best-before date is 6 months from the manufacturing date, and after opening it is kept in the refrigerator. The shop advises not to put it in the freezer
The basis for this section is the Rakuten Ichiba product page and Rakuten customer reviews (accessed November 4, 2026). These are trends in the reviews within what we read and may not reflect the product’s current condition.
Prices, stock, shipping fees, and delivery dates are subject to change. This article’s information-as-of date is November 4, 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 the Rakuten Ichiba product page and review site. Product details such as amount, storage method and ingredients are subject to change. Please check the product page for the latest information.
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: November 4, 2026 / Sources: Rakuten Ichiba product page, Rakuten customer reviews, Consumer Affairs Agency, Japan, “About Allergen Labeling”
