Young Japanese teacher named Satoshi Yabe started to work in the sixth grade of elementary school, naively believing that it is not necessary to wait for 12 -year-old kids big surprises. It was the greatest mistake of his life,For the latter-day class teacher waited Maruy sister - the most dangerous triplets Japan! The eldest, insidious sadist Mitsuba, their plans will give odds to Machiavelli. Average, muscular athlete Futaba - seemingly simple-minded girl, but uh... specifically developed imagination. Finally, the youngest,Hitoha mysterious - a living illustration of the thesis " still waters run deep." These are the student waited in 6 - in -class next sower " reasonable, good, eternal." From now on the life of Yabe - sensei turned into a minefield, where there is no room for error. It is in such circumstances would have to grow professionally young teacher,and we learned a lot about life and relationships in Maruy family. Well, the main character is left to understand what is better - when the three sisters of fun wish you well, or vice versa?!