Arimoto Toshimi

The protagonist of the story, a gentle boy who is so cute that he is mistaken for a girl based on his appearance. Toshimi's house is a cafe where he sometimes helps out.

He loves his two older sisters, Tomomi and Hitoka. Even though the sisters treat Toshimi as their toy, he remains obedient to them out of fear of being disliked by them. He doesn't have much physical strength, he often faints after the intercourse is over.