A series of very graphic adult Gravitation doujinshi by the original mangaka:
 
Panda パンダ (Yuki uke, Seguchi x Yuki x Tatsuha) (2006) 
Kumagorou くまごろう (Shuichi x Yuki) (2006) 
Capybara カピバラ (Eiri x Shuichi / Hiro x Suguru ) (2007) 
Sakana 魚 (2013) 
Hyoko ひよこ (2013) 
Ushi 牛 (2013) 
Chirimenjako ちりめんじゃこ (2014) 
Torokeru Pudding とろけるプリン (2015) 
Ookami 狼 (2016) 
Kitsune キツネ (2017)

Shindou Shuichi is a young, energetic, and optimistic rockstar wannabe. He’s in a band with his best friend and is determined to top the charts. When a romance novelist named Eiri Yuki criticizes his lyrics, Shuichi takes it badly and wants to make Yuki eat his words…but as he starts to follow Yuki around, Shuichi falls hard for him. Yuki, despite his cold and prickly demeanor, even seems to like Shuichi back! Still, Yuki has a past full of trauma that he’s never fully faced, and Shuichi discovers that succeeding in the music biz might cost him his soul. Can these two very different men support each other and make this relationship work? (Source: Seven Seas Entertainment) Note: Includes 2 extra chapters.

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