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)