Episode Title:Vision Time.Episode Description:Koro-sensei takes the students of Class 3-E to their own private pool that he made, but the students are alerted when Koro-sensei's tentacles swell up when soaked in water. Meanwhile, Terasaka becomes irritated when his friends Takuya Muramatsu and Taisei Yoshida are getting along with Koro-sensei. Terasaka agrees to collaborate with Shiro and Itona in their assassination plan, previously dropping a "bug bomb" in the classroom to excrete Koro-sensei's mucus and secretly adding a transmitter in the pool. Then, Terasaka gathers the other students in the pool, using a gun connected to the transmitter as a signal for Shiro and Itona. Instead, the transmitter sets off an explosion and puts the students in danger, forcing Koro-sensei to get his tentacles soaked in order to rescue the students from being swept away. Koro-sensei is left at the mercy of Itona, while Sumire Hara is hanging onto a tree branch nearby. Following Karma's plan, Terasaka uses his shirt still affected by the "bug bomb" to infect Itona, allowing Koro-sensei to rescue Hara whilst the other students splash water to halt Itona. Shiro and Itona are forced to withdraw yet again.