Episode Title:Confession Time.Episode Description:Determined to save Kaede before the tentacles kill her, Koro-sensei asks his students to think of a way to make Kaede forget her bloodlust while he lets her attack his weak point. Nagisa decides to use what he learned from Irina and delivers a powerful French kiss to Kaede, shocking her long enough to allow Koro-sensei to safely remove her tentacles. Shiro, who suddenly appears with The Reaper, reveals his identity to be Kōtarō Yanagisawa, a face that Koro-sensei is all too familiar with. After Kaede recovers, Koro-sensei proceeds to tell the truth about his past, unveiling that he was The Original Reaper. Two years ago, The Reaper was captured by Yanagisawa and brought to a lab, where he met Aguri. As The Reaper underwent experimentation with Yanagisawa's tentacle formula, he became well acquainted with Aguri, revealing that he was captured after being betrayed by a pupil who would go on to become The Second Reaper.