Seiji Matsuyama (松山 せいじ, Matsuyama Seiji, born April 28, 1975) is a Japanese manga artist from Fukuoka Prefecture. He is known for drawing many works featuring women with extremely large breasts, and he himself refers to himself as a "boobie manga artist" in his doujinshi and other publications. He is married to fellow manga artist Sayu Matsuyama (松山 紗夕, Matsuyama Sayu).
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