Arata Kasuga, a high school student, is being targeted by a girl with humongous boobs. In exchange for his life, Lilith says that she can erase his memories, but he chooses the third option. As a result, he ends up at a magic school, but why is there a naked girl in the men's bath?
I know everything from assassination 
to really sexy ninja techniques.
Ich weiß alles über Attentate bis
hin zu echt sexy Ninja-Techniken.
Lo sé todo sobre el asesinato y 
una que otra técnica pervertida.
Lo sé todo sobre el asesinato y alguna 
que otra técnica subidita de tono.
Je sais tout faire, de l’assassinat
aux techniques érotiques…
Conosco tutto delle tecniche ninja,
 da quelle di assassinio a quelle erotiche.
Eu sei de tudo, desde técnicas de
 assassinato até as pervertidas.