Hakka Haien no Shujin to Shitsuji

After fleeing a specialized child development facility, Jougasaki Nanaki has been surviving alone by stealing. He meets an acquaintance from his past, who brings him to a dilapidated mansion on the town's edge. There, he encounters a young boy who vanishes through a wall. Curious, Jougasaki stays at the mansion, taking on the role of butler to uncover the boy's mystery.