Ep. 20: Karma Evades Gas Attack While Nagisa Disguises as Girl to Clear Path to VIP Floor
Aired on June 6, 2015

Karma dodges Grip’s lethal gas borrowed from Smog and retaliates, allowing students to bind Grip and proceed to the sixth floor. To unlock the stairwell’s back entrance, the girls navigate the lounge while Nagisa, disguised as a girl, attracts the attention of Yuuji. Yuuji angers a yakuza while trying to impress her, but the girls knock him out, clearing the way. Nagisa advises Yuuji to change his behavior before the group advances to the VIP floor. There, Terasaka neutralizes bodyguards with stun-guns, and Chiba and Hayami receive the resulting pistols. The students then confront Gastro on a theater stage to reach the next set of stairs.
Episodes
- Ep. 16 · Class 3-E and 3-A compete in exams, earning tentacles and an Okinawa resort wager.
- 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.