Kyohansha no hosoku (B-PRINCE Bunko)

[Machine Translation] Mikuriya and his partner, Koshigaya, head to the scene of the crime and find the dead body of Motomiya, a former student friend of Mikuriya's. Motomiya was a teacher at a cram school Mikuriya attended at the time. Motomiya, who was a teacher at the cram school Mikuriya attended at the time, taught Mikuriya to have sex with her when he became bored with his boring life and indulged himself in the act. Mikuriya confided his past to his partner Koshigaya and set out to find the culprit. Then, a man from Motomiya's past surfaces! Meanwhile, the relationship between Mikuriya and Koshigaya changes as a result of their shared secret...

「江東区の廃ビルでコロシだ」捜査一課の御厨と相棒の越谷が現場に向かうと、そこには御厨の学生時代のセフレだった本宮の死体があった。当時、御厨が通う学習塾の講師をしていた本宮は、退屈な毎日に飽きていた御厨にセックスを教えその行為に溺れさせた。御厨は相棒の越谷に過去を打ち明け、犯人捜しに乗り出す。するとそこには、本宮の過去の男が浮上し!?一方、秘密を共有したことで越谷との関係にも変化が生まれ...。