Yasunaga, Fukujiro
Summary
Fukujiro Yasunaga makes his debut in Chapter 1, with his name finally being revealed in Chapter 77. He is a fifty-three-year-old Japanese history teacher who also serves as Kenichi’s homeroom instructor. Alongside Kyōko Ono, he visits Ryōzanpaku to investigate rumors suggesting that Miu is residing with a male student, though the misunderstanding is eventually resolved. Yasunaga holds a deep admiration for Koetsuji, often referring to the martial artist as sensei. His polished, shiny bald head is a frequent subject of jokes, most notably when Niijima spots him from a distance by the reflection of his head while searching for assistance. This occurs after Yasunaga, Kenichi, Miu, and Tanimoto become lost during a school trip to the snow following an attack by Jihan.
