It is related to the "Trigun" franchise. The book was first sold at Comiket 105. OUR PROMISE.
Touhou Project Doujinshi “Happy Triangle” (ハッピー トライアングラー) – Anime Fanbook – Mint
Doujinshi HAPPY CRAZY WORLD! Art Book A5/62P SCCK31 Kore! IZ
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