筒抜ことは知っている。

Tsutsunuke to wa Shitteiru.

"I know the secrets of everyone in this class☆" That is how the twin-tailed new transfer student, Koto Tsutsunuke, introduced herself to the class. Her new classmates are shocked by her brash remarks. And the teacher is no exception to "everyone in this class"... Seeing her grinning face, the students realized… This girl is dangerous. Now, their ordinary school life is over, as everyone's darkest secrets become exposed. (Source: Kadokawa, translated)