Yamada Ryu, a second year student who attends the prestigious Suzaku Private High School, is a problem child who comes to school late and leaves early, is prone to fighting all over the place, and even nods off in class. One day, he falls down the stairs with the honor student Shiraishi Urara. They faint, and when he wakes up in the infirmary he's turned into her!
I won't allow Yamada-kun 
to kiss another woman!
Ich lasse nicht zu, dass Yamada-kun
ein anderes Mädchen küsst!
No quiero que Yamada-kun bese a otra mujer...
No quiero que Yamada-kun bese a otra mujer...
Je refuse que tu embrasses
une autre fille !
Non permetterò che Yamada-kun 
baci un'altra ragazza!
Não vou deixar o Yamada beijar outra!
Я не позволю, чтобы
кто-то ещё целовал Ямаду!