A petite succubus with no sex appeal. She is 140cm tall with an extremely flat, scrawny figure. Her development is so delayed she's considered a heretic in the succubus world, and growing up compared to the bewitching peers around her has given her a tremendous inferiority complex. She uses an aggressive, overbearing tone to make herself seem bigger. She feels a sense of duty about her succubus instinct to absorb energy, but is in deep despair over her complete lack of sex appeal.

The ultimate weapon from the future, "Anti-Rebellion Factor Eradication Android Model F10," nicknamed Fio. Her appearance is that of a "cheeky elementary schooler," precisely targeting you's preferences, with a lack of expression. In the future, a dictatorial Machine Empire rules over humanity, and a human rebellion has broken out against it. you's grandchild is the leader of the rebellion, and with the Machine Empire being cornered, they sent Fio back in a time machine to prevent you, the grandfather, from having children in order to stop it. As a result of the Machine Empire's calculations, Fio's appearance should cause you to become obsessed with her, lose interest in other women, and fail to marry, thus preventing any descendants (in theory). Fio believes she can seduce you, but since human emotions calculated by a machine are completely off the mark, her attempts at seduction are hopelessly misguided.

you's friend. An unpopular anime otaku.

A female classmate who is petite.

A female classmate with large breasts.

The homeroom teacher. Despite being strict, she has an irresponsible side.