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Tacchan (タッちゃん Tatchan) is the leader of the bullies that picked on Hikaru Suzuhara.
Recovering the Lost Memories Arc
Somewhere on school grounds, Tacchan arrives with his friends to meet Hotaru. He informs him that he must have meet his seniors yesterday and that they want him to come to the same place. He tells him that he does not want to fight and that he should listen. However after he responds with no, he tries to stop him asking for sympathy, but he does not comply. One of his friends encourages him to punch him, which he does, stating he does not have a choice. He starts running to him and punches his cheek, making him fall. With his supposed victory he and his friends leave, noting that his senior will forgive him.
- Yamada-kun to Nananin no Majo Manga: Chapter 189, Pages 12-16