Eita and she were a couple in her previous life. When not immersed in her delusions, Himeka is really quiet and usually only answers questions by nodding. Other girls often call her . After hearing of Ai's fake boyfriend story, she refers to Ai as the "Master of Love". Ai is Eita's "fiancée" and childhood friend whom he knew a year before he met Chiwa and who moved away ten years ago but has recently returned. Ai considers herself to be the one for Eita because she confessed to him while they were in kindergarten and they even signed a makeshift marriage registration, making them engaged, although Eita didn't understand the concept of marriage. Ai has lied about having a boyfriend in college, and also keeps a notebook like Eita's. Nobody else except Kaoru and Himeka knows this. She often has delusions of herself and Eita as a couple. As a member of the student discipline committee, she attempts to stop Chiwa and Masuzu's club activities, but later decides to join the club to win Eita back. Saeko is Eita's aunt whom he has lived with since his parents abandoned him. She works at a gaming company that makes mostly bishōjo games, is an expert with such games and always makes analogies of the real world to them with respect to girls. She is a workaholic who can survive long periods of time without sleep. Despite their protestations to the contrary, she knew immediately that Eita and Masuzu were not really a couple just by observation. She often gives Eita advice about getting along with girls and has even told him how to disengage himself from the other girls in case he has chosen one of them. Kaoru is Eita's classmate and his best friend, who sat next to him until the seat change. Kaoru has known Ai since elementary school and calls her A-chan. While initially thought to be male, it is hinted in the story that Kaoru might actually be a girl, or in love with Eita. In the light novels, it is revealed that Kaoru is in fact a girl. Mana is Masuzu's little sister, who is seen with a bodyguard at all times. She wants her older sister to come back to Sweden, and even reports on her activities to their father. Even though her relationship with Masuzu is complicated, she seems to love her sister.