• Book Name: OTON Manga
• Alternative(s): タフ外伝 OTON; タフ外伝 OTON-おとん-
• Genre(s): Action Martial Arts Mature Seinen
• Author(s): Saruwatari Tetsuya
• Year 2004
• Status: Ongoing Download Manga
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Summary: A series dedicated to the father of Kiichi from the series Tough. This is a side story of the Tough series based around Miyazawa Seiko (Kiichi's father) and his brother Kiryu. Much of the same elements of Tough can be found here such as Mixed Martial Arts Fighting and alot of Violence.