Boogie-kun

ブギーくん

Anju's sarcastic talking doll. He frequently tells Karin how useless she is, which typically results in Anju punishing him. The other dolls in Anju's room also talk and possess their own personalities, but "Boogie-kun" is her favorite. Boogie-Kun is actually a murderer's spirit trapped in a doll who becomes upset when he is away from Anju for too long. In volume 3 of the manga, one of Anju's classmates takes Boogie-kun, with grievous consequences until Anju comes to take Boogie-kun back.

Spoiler