Noyama Ringo

He is the third only son and youngest child of the Noyama family, who has a cheerful and gentle personality, and naturally excels at housework as he often helps his mother with chores.
At school, he is envied for having three beautiful older sisters, but he is not aware of it. He has the same sex drive as most boys at school. But after he learned how to masturbate, even the most casual of things immediately give him an erection.