Responses
He comes in the second or third volume I guess. He once saw Morinaga and Senpai making out (which shocked him good because he knew Senpai as a homophobe and originally wanted to help Tomoe/Senpai's brother and his husband to get his acceptance). With this info he threatened senpai to tell his brother and thus blackmailed him to accompany him at karaoke (Doraemon). In short: He is one of the only people who know about their relationship.
Who was this guy? I’d appreciate it if you could also tell me which chapter did he show in for the first time ( ̄∇ ̄")