Kyoko is the small blue-haired girl who runs the science division of the Eiken Club, and would seem to be the second-in-command of the club. Despite her age, she looks a lot younger than she really is. She often hurts Densuke with her various inventions (rockets, electrocuters). In the English version, her name was romanized as Kyouko Morooka. Chiharu's energetic sister, she looks like a short-haired cheekier version of Chiharu. Despite being fully aware of Densuke and Chiharu's feelings for each other, Yuriko likes trying to get between them. Sensei is never named, though she is a teacher from Zashono Academy, she often laments the fact she always seems to go unnoticed by her students and peers, not to mention the fact that they never seem to remember her name. She has bright green hair. In the English version, she was simply called the Teacher. Teddy is a very shy young girl, who wears a giant bear suit most of the time. She has an older sister, who also wears a similar suit. Chiharu's cousin, who also has a crush on Densuke. Her timetable always seems to be occupied by many part-time jobs. Densuke eventually finds out that she is secretly funding detectives who promised to find her long-lost father who left almost without a word after the divorce (due to the bankruptcy of his factory). She is head of Zashono Academy's Committee of Student Accountants. She had mysteriously returned to the academy over a two year span with an immediate action of carrying out her own budget plan:to forcefully cancel all the activities of all the clubs in the academy, despite all the dirty tricks she has in mind. The ex-head of the Supernatural Club in Zashono Academy, a slim and weedy girl whose body is dotted with bandages from the countless bruises and wounds caused by falling due to fainting resulted by her anemia. The mother of the Shinonome family. The younger brother of Chiharu. He first appears pretending to be Chiharu in order to test Densuke. He is practically Chiharu's twin, and it is hinted that he is interested in Densuke, whether that is true or not, is not known. He is the champion of the previous academy tournament who has returned from America to win the heart of Chiharu Shinonome. He is aware of Densuke's feelings for her, and feels that competition is the only way