Male / 12 years old A completely unhinged brat. He shares the same birth year as Michina. Although his actual birthday is May 3rd, he causes confusion by claiming he was born on June 6th at 6:06:06. He also claims to consume blood, but he is actually just drinking strawberry syrup. A gloomy boy with dark circles, a creepy smirk, and a severe case of eighth-grader syndrome who practices all sorts of curses and sorcery. If that were all, he would just be a weird kid, but he actually possesses a talent for curses; when he targets someone, it never ends as a joke. He hates Michina.

Male / 16 years old Soichi's older brother and the eldest sibling. He is a handsome young man who looks nothing like his brother and is a perfectly rational person. He is often tormented by Soichi's bizarre behavior. Although he is frequently pestered by or scolds Soichi, he still looks after him like a proper older brother when necessary. When Soichi was about to be harmed by the owner of the Three-Tree Forest, Koichi saved him by pointing out the traps the man had set, arguing, "Let's go to the police and see what they think about you illegally setting traps that could seriously injure a person," forcing the man to back down. Despite being such a good brother, Soichi constantly grumbles and threatens to curse him for "looking down on him." However, Koichi is so sharp that Soichi is usually the one who ends up defeated, and while the curses occasionally cause trouble, Soichi almost always suffers the consequences in the end.

Female / 14 years old When Soichi introduces his sister, he calls her a "pitiful human who thinks she's pretty," and says he worries about the future of both her and Koichi. However, by all appearances, his sister is a beauty, and the only one whose future is actually worth worrying about is Soichi.

Soichi's parents.

Male / 15 years old Michina's older brother. He is considered quite handsome in the story and seems to be popular with girls.

Female / 13 years old A girl who is Soichi's relative. She comes to visit Soichi's house in the countryside with her older brother, Yusuke. She is disgusted by Soichi's terrible tastes but also seems to pity him, occasionally treating him with kindness. She is effectively Soichi's natural enemy. She dislikes Soichi.