Two sisters with huge personalities are neighbors and give private lessons to their neighbor Wataru. When he goes to class, he notices they are waiting for him, dressed as sexy nurses. They put their huge boobs in his face
and ask him which is better. He can't decide as they are both so big and divine. After they finish, Wataru finds out that his dad called his neighbors to convince him to go live with him in the United States. He doesn't want to leave, and she doesn't want him to leave, but they don't want to be his surrogate mothers. They want to be his wives.