■Protagonist: Yuyu A 7 year old J-class second year student. A girl who has grown up recently but is still innocent and obedient ■The man who lives next door A man who shows Yuyu the freedom of being a single aristocrat (his sexual desire is higher than most people) ■Story The house next to the man (old man) J-kei Yuyu lives with her parents in . The old man is secretly targeting Sayashi Yuyu, who always cheerfully greets everyone.