Hanabatake Yoshiko é uma garota idiota que ama bananas. Seu amigo Akkun tenta colocá-la na linha.

Yoshiko faz amizade com crianças, mas elas perdem a animação após Akkun contar a verdade sobre Yoshiko. Além disso, a irmã de Akkun encontra problemas com os estudos.

A mãe de Yoshiko critica a amizade de Akkun com Sayaka. Após tudo se resolver, Yoshiko decide agradecer um revendedor de bananas que mora longe.

Yoshiko leva seus amigos para um espetáculo de rangers, mas cria uma confusão.

As férias de verão começam e o Yoshiko faz plano com seus amigos.

Yoshiko and friends arrive in Izu Atagawa, change into their swimsuits, and head straight for the waves. The disciplinary committee president tries to flaunt her precious rack, but fails and is buried in the sand as punishment by Yoshiko. Yoshiko goes on rampage and buries Sayaka as well, and starts sculpting some ------- and a ***** on them too!

Emura Akane, Shiina Kuroko, and Hiiragi Himeko are hanging out in the classroom after school when Yoshiko sets her sights on them. The girls, completely unable to read Yoshiko's behavior, get roped into playing with her. They agree to play hide and seek in order to escape Yoshiko, but then...

Nozomi, Masaru, and Mamoru go to buy snacks for their field trip, with 300 yen each as their budget, when Yoshiko tries to initiate them into the finer points of buying field trip snacks. Masaru and Mamoru follow Yoshiko's teachings as they buy their snacks, but Nozomi buys a single expensive snack. Nozomi's field trip will end dark and gloomy... or so they thought!

In order to make the cultural festival that she looked forward to so much a success, Emura volunteers to join the cultural festival committee. Progress on the class attraction is slow, so she and her friends stay overnight at school to get some work done, but then Yoshiko enters the scene. The three girls try to get rid of her, but they get sucked into her game...

Yoshiko goes out for a walk with her dog. But their walk is no simple walk. Yoshiko rides on her dog's back, and eventually they reach the mountains. A race breaks out between Yoshiko and her dog traveling at unprecedented speed and the legendary rider of the peak. Who will be the victor?

Yoshiko finds her soldier, Ryuuichi, in tatters. Yoshiko asks what happened, and he responds that he was done in by guys who have wasted bananas. Yoshiko stands silently, anger boiling up from within. They are unforgiveable! I shall fight! Yes! For bananas everywhere! ...wait, bananas?

Ten years ago, Yoshiko met Akuru. Childhood friends, the kid next door, the old cliché story, shattered into a million pieces with the tragedy which unfolds. Young Akuru seeks the power to defeat Yoshiko, surpassing his limits out of fear. What is born in the young Akuru's heart?