Mitsudomoe Zouryouchuu!

The Marui triplets are back for their final year of elementary school, and Satoshi Yabe, homeroom teacher of class 6-3, has more or less grown used to them, though that hardly makes his life easier. The quietest of the sisters, Hitoha, behaves far more calmly than the others, yet it is her hidden provocations that most often lead to the most absurd situations, dragging in practically the entire class.

The new term begins with Yabe's latest attempts to keep discipline, but any ordinary situation quickly spirals out of control thanks to the sisters' imagination. A simple notebook check turns into a huge scandal after entries are accidentally swapped, sports events end with suspicions about certain students' odd inclinations, and preparations for school events come with ridiculous rumors spreading across the whole school. Nearly everything the sisters do sets off a chain of consequences that pulls classmates, teachers and random witnesses into completely absurd circumstances. Meanwhile, Yabe still suffers from his shyness and his inability to talk normally with the school nurse, Aiko Kuriyama, on whom he has a big crush.