A high school girl who is stupid both academically and socially. She even gets zeroes on multiple choice tests. She is almost always seen hanging around her neighbor, childhood friend and classmate Akutsu whom she calls "A-kun". She is very energetic.Her favorite food is bananas.

Akuru is a smart and serious high school student who is constantly annoyed by Yoshiko's antics. The reason he and Yoshiko are classmates is because he chose to attend a local high school as the really academic schools were too far away that he wouldn't get much time to study. He scolds Yoshiko for her idiotic behavior, even resorting to punches.

Akuru and Yoshiko's classmate who ends up becoming friends with the two. She too is level-headed and assumes the straight-man role (tsukomi), often moderating interactions between Yoshiko and others.

An unnamed girl who is in charge of morals at the school. She cannot stand Yoshiko's idiocy. When Akuru starts complimenting her by accident, saying princely things like "If (Yoshiko) gives you any more trouble let me know." and "She's a hundred times more attractive than (Yoshiko)", she develops a major crush on Akuru.