• Book Name: Touhou - What’s This Thin Book? (Doujinshi) Manga
• Alternative(s): Touhou - Nandesuka Kono Usui Hon?; Touhou - What’s This Thin Book?; Touhou dj - Nandesuka Kono Usui Hon?; Touhou dj - What’s This Thin Book?; 何ですかこの薄い本？
• Genre(s): Comedy
• Author(s): Takishima Asaka
• Status: Completed Download Manga
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Summary: "Sakuya gets a quite immodest book in the mail. Now, who in Gensokyo could be responsible for such indecency?"