Introduction

A returnee, Yu, is transferred to the high school of the main character, Ai.
One day, a student appears on the playground crawling on all fours, but the day passes as if nothing happens.
A few days later, however, a human pyramid is formed on the ground when the students arrive at the school.The students are forced by their teachers that they join this pyramid.The students are confused at first,but join the pyramid soon. on the other hand, Ai, Yu, and their friends try to escape under the teacher's watchful eye.

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