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This report was last updated 11/23/2023.
Refresh the report to view the most up-to-date data available:
Refresh the report to view the most up-to-date data available:
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Report Info:
Note: While Amazon.co.jp claims 39 Ratings, we counted 19 Reviews available on their site.
Note: We only analyze "reviews" and ignore one-tap "ratings".
Note: We only analyze "reviews" and ignore one-tap "ratings".
Report Card
Fail Overall Grade
FAIL
Suspicious Reviewers
![](/public/imgs/reviewmeta/su-icon.png)
WARN
Reviewer Participation
![](/public/imgs/reviewmeta/ex-icon.png)
PASS
Rating Trend
![](/public/imgs/reviewmeta/rt-icon.png)
PASS
Unverified Purchases
![](/public/imgs/reviewmeta/vp-icon.png)
PASS
Word Count Comparison
![](/public/imgs/reviewmeta/wc-icon.png)
PASS
Overlapping Review History
![](/public/imgs/reviewmeta/rh-icon.png)
PASS
Reviewer Ease
![](/public/imgs/reviewmeta/sc-icon.png)
PASS
Brand Repeats
![](/public/imgs/reviewmeta/re-icon.png)
PASS
Deleted Reviews
![](/public/imgs/reviewmeta/dl-icon.png)
N/A
Phrase Repetition
![](/public/imgs/reviewmeta/pr-icon.png)
N/A
Incentivized Reviews
![](/public/imgs/reviewmeta/ic-icon.png)
Most Trusted Reviews
程よくリラックスできる... [Go to full review]
May 24, 2023
100%
TRUST
TRUST
-
Verified Purchaser
-
Critical Reviewer (avg. rating: 4.0)
Least Trusted Reviews
お誕生日プレゼントに買... [Go to full review]
Jul 12, 2023
19%
TRUST
TRUST
-
Verified Purchaser
-
One-Hit Wonder
-
Overrepresented Participation (posted 1 Review)
-
Easy Grader (avg. rating: 5.0)
Analysis Details
Fail
Suspicious Reviewers
![](/public/imgs/reviewmeta/su-icon.png)
One-Hit Wonders
12 of the 19 reviewers have only reviewed this product. This is an excessively large percentage of One-Hit Wonders which may indicate unnatural reviews.
Warn
Reviewer Participation
![](/public/imgs/reviewmeta/ex-icon.png)
-
- 89%
- From reviewers with an overrepresented participation
We see the following 1 participation group with a statistically significant greater concentration than what we'd expect to see:In total, we found that 17 reviewers (or 89%) are within an overrepresented participation group. This is an excessively high number of reviewers in overrepresented participation groups.
Pass
Rating Trend
![](/public/imgs/reviewmeta/rt-icon.png)
-
- 0%
- Created on high-volume days
We counted 19 reviews for this product over the span of 72 days, an average of 0.3 reviews per day. If these reviews were created randomly, there would be a 99.9% chance that we would see 3 or fewer reviews on any given day. We didn't find any days exceeding this threshold.
Read more about our Rating Trend test.
Read more about our Rating Trend test.
Pass
Unverified Purchases
![](/public/imgs/reviewmeta/vp-icon.png)
3 of the 19 total reviews for this product are unverified purchases. This is within an acceptable range and it does not appear to be significantly affecting the overall rating for this product.
Unverified purchases may be the result of Kindle Unlimited readers, buyers who didn't pay full price, or reviewers who did not purchase the product at Amazon. Read more about our Unverified Purchases test.
Pass
Word Count Comparison
![](/public/imgs/reviewmeta/wc-icon.png)
Word counts are approximated for Hanzi and Kanji
-
- 0%
- Have an overrepresented word count
We didn't find any review word count groups that had a statistically significant greater concentration than what we'd expect to see in this category.
Read more about our Word Count Comparison test.
Read more about our Word Count Comparison test.
Pass
Overlapping Review History
![](/public/imgs/reviewmeta/rh-icon.png)
-
- 0%
- Substantial overlapping review history
0 of the 19 reviewers have substantial overlapping product review history. This is within an acceptable range and it does not appear to be significantly affecting the overall rating for this product.
Read more about our Overlapping Review History test.
Read more about our Overlapping Review History test.
Pass
Reviewer Ease
![](/public/imgs/reviewmeta/sc-icon.png)
The ease score is the average rating for all reviews that a given reviewer submits. The average ease score for reviewers of this product is 4.1, while the average ease score for reviewers in this category is 4.2.
4.1 Product's Average Ease Score
4.2 Category's Average Ease Score
Read more about our Reviewer Ease test.
Pass
Brand Repeats
![](/public/imgs/reviewmeta/re-icon.png)
Brand Repeaters
We didn't detect a substantial amount of Brand Repeaters.
Pass
Deleted Reviews
![](/public/imgs/reviewmeta/dl-icon.png)
- 0
- Reviews have been deleted
We have not discovered any deleted reviews for this product.
There are a few limitations to keep in mind regarding the Deleted Reviews test:
There are a few limitations to keep in mind regarding the Deleted Reviews test:
- We don't have a magic ability to collect every single deleted review; we can only identify reviews as deleted if we collect them on one date and then notice they are no longer visible on a subsequent date.
- We have no information on reviews that were never published in the first place.
- We also don't know why these reviews were removed. It could be action from the platform, personal decision by the review author, part of an entire account closure, even some data error on our part, etc.
N/A
Phrase Repetition
![](/public/imgs/reviewmeta/pr-icon.png)
We have not yet completed optimization for this test for Hanzi or Kanji.
N/A
Incentivized Reviews
![](/public/imgs/reviewmeta/ic-icon.png)
We have not yet completed optimization for this test for Hanzi or Kanji.