Ep. 21: Koro-sensei uses nicknames to confuse Gastro while Takaoka reveals his plan involving Kayano and the antidote.
Aired on June 13, 2015
Koro-sensei employs varied nicknames to mislead Gastro, allowing Chiba and Hayami to overcome previous failures. As the group ascends, Koro-sensei realizes the mastermind is not an assassin, and Nagisa discovers Terasaka has concealed his own virus infection. Upon reaching the top floor, they identify Takaoka as the culprit, who intends to use Kayano to kill Koro-sensei upon his emergence from crystallization. Seeking revenge for past humiliation, Takaoka challenges Nagisa to a rematch. Although Nagisa complies with demands to kneel and admit cowardice, Takaoka detonates the antidote. Believing everyone will perish, Nagisa grabs a knife to kill him.
Episodes
- Ep. 17 · Hinano and Taiga prepare while Lovro trains students for the island assassination mission.
- Ep. 18 · Students face a virus threat while Koro-sensei remains trapped in an indestructible crystal sphere.
- Ep. 19 · Karasuma and Irina infiltrate a guarded hotel while facing Smog and Grip
- Ep. 20 · Karma Evades Gas Attack While Nagisa Disguises as Girl to Clear Path to VIP Floor
- Ep. 21 · Koro-sensei uses nicknames to confuse Gastro while Takaoka reveals his plan involving Kayano and the antidote.
- Ep. 22 · Terasaka intervenes as Nagisa overcomes Takaoka using Lovro's technique and a stun-gun.