Youkoso Jitsuryoku Shijou Shugi no Kyoushitsu e

It's mid-December and the second semester is about to end. Ryūen from C-Class is persistently trying to pinpoint the mastermind, X, of D-Class. Even Kōenji has become a target of suspicion. After narrowing down the suspects, Ryūen's demon hands has finally reached Kei Karuizawa... Amidst all these events, Kiyotaka has abruptly been called by Ms. Chabashira. Chabashira is showing a rarely faint-hearted expression as she is guiding him to――

"The notification for you dropping out of school has been prepared. The principal has also agreed. All we need is your "yes", to put an end to this."

"Your orders were only absolute when I was still inside the White Room. That room no longer exists so I have no reason to obey them."

Kiyotaka's father is pressing for him to drop out. Then, the school's board chairman is revealing the secret system behind the Advanced Nurturing High School――!?

Source: You-zitsu.wikia