Member of the Roman Club. He is in class A-1. He has a peeping fetish, and is often called an octopus face. His opaque glasses conceal his eyes most of the time. For reasons unexplained, he is balding in his teenage years. His classmates frequently use this to insult him. He wants to be a lawyer by using help of OBs after graduation.

Katsu develops feelings for Kyouko by vol. 2. He first reveals this overtly when attacking Yasu for exploiting Kyouko sexually. He again defends her in vol. 4 by taking a punch from Yasu that was meant for Kyouko. Also he develops a fetish for big boobs.
(Source: Wikipedia)

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