Yoshiko Hanabatake is an idiot. She is so ditzy she gets zero on all her tests, she just wants to play and run around all day and not ponder her future, and she loves bananas. Her closest friends are Akuru Akutsu, a smart and serious student, and Sayaka Sumino, a kind and level-headed schoolgirl; both of whom must put up with Yoshiko's escapades.