Seiji Matsuyama (松山せいじ Matsuyama Seiji, born April 28, 1975?) is a Japanese mangaka, and the creator of the fanservice-themed manga/anime Eiken. He has a variety of hobbies, including video games, and collecting figurines and toy models.
- Eiken (2001-2004)
- Ura Kendou Zero
- Eiken (anime; end credit illustration)
- (Japanese) Seiji Matsuyama's personal blog
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