|Other names||Uncle Hisatora|
Tatsumi's Father (older brother)
|Physical and Vital Statistics|
Hisatora resembles a lot to his nephew, as both have messy black hair and tired golden eyes. Due to his scruffy appearance, he is constantly mistaken as a pervert, manly by Tatsumi's classmates.
Hisatora is very dedicated to his work. He continually develops suspicious "medicines" and has Tatsumi test them out, who always refuses but ends up accepting because Hisatora threatens him with leaking out information when he was in seventh grade.
- In Chapter 57, he discovers the existence of Wakasa but forgets about it the next day because he was drunk and didn't remember anything.
- He has a key of Tatsumi's house.
- He is the younger brother of Tatsumi's father.