Gucchan

About

Gucchan is Komaki's best friend at the start of the story.

It's hinted that she always liked Komaki's boyfriend, Takayama. When Komaki refuses Takayama's proposal to take their relationship to the next level, Gucchan convinces him to sleep with her. Komaki, thanks to her new ability, finds out Gucchan betrayed her and breaks off their friendship.

Gucchan's real name is never revealed; Komaki only ever calls by her nickname.

It's implied that she becomes Takayama's new girlfriend.