[Matsuyama Seiji] Kinjo no Chuugakusei no Otokonoko ga Watashi no Mune o Chirachira Mite kuru node... Sex o Shite ageta Hanashi. [Digital]

[Matsuyama Seiji] Eiken Makaizou (Eiken) [English] [Mongolfier] [Digital] [Incomplete]

[Matsuyama Seiji] Onegai Makoto Sensei (Space Battleship Yamato 2199) [Digital]

[Matsuyama Seiji] Otona no Zokusei Late2015 [Digital]

(C83) [American Kenpou (Kikuchi Seiji, Yabuki Gou)] Yoroshikereba Assistant Boshuu (Chuunibyou Demo Koi ga Shitai!)

[Matsuyama Seiji] 50-sai no Haha ga Erosugite Nakadashi Sex o Shite moratta Doutei no Boku [Digital]

[Matsuyama Seiji] Eiken Makaizou (Eiken) [Digital]

[Matsuyama Seiji] Eiken Makaizou 3 (Eiken) [Digital]

[Matsuyama Seiji] Azusa-san ga Ore no Yome de Eiken Mitai na Chou Bakunyuu dattara (THE iDOLM@STER) [Digital]

[Matsuyama Seiji (Matsuyama Seiji)] Oppai Momu? [Digital]