*Awarded first place in the category Love & Relationships in Amazon Kindle Japan *

This is a Japanese book.
Kindle version is also available, and description is written in Japanese on Kindle sales page. For example:

http: //www.amazon.com/dp/B00J62YTSM/
http: //www.amazon.co.jp/dp/B00J62YTSM/
(Please find this book in the Kindle store of your country.)