FREED BY DEATH, CHAINED BY FRIENDSHIP.After being saved by his classmate Kuchina Hitsujimoto, Sousei decides he wants to thank her. However, what starts out as a letter of gratitude eventually develops into an exchange diary also involving Asumi Shiramori, Hina Shigee, and Yukisada Hayashi. Kuchina enjoys writing to her classmates, yet she can't help but feel pain whenever she has fun--a mindset conditioned into her by the boss of the All-Japan Assassin Association, Furuhiko Kagemiya. Eventually, she's forced to choose between her friends and peace...Meanwhile, Sousei hunts down the leader of a criminal organization but finds himself continuously thwarted by a naked, steel man!