You are going to Watch Assassination Classroom Episode 21 English dubbed online free episodes with HQ / high quality. Stream Anime Assassination Classroom Episode 21 Online English dub Takaoka Time. With Gastro having a keen sense for determining an opponent’s location, Koro-sensei gives instructions to the students using alternating titles in order to confuse Gastro, giving Chiba and Hayami the encouragement to rise above their failed assassination and get the drop on Gastro. As the students approach the top floor, Koro-sensei deduces the mastermind isn’t an assassin, while Nagisa learns Terasaka has been hiding that he got infected with the virus himself. Arriving on the top, the group discover the mastermind to be none other than Takaoka, who had planned to use Kayano in a plot to kill Koro-sensei when he emerges from his crystallized form. Wanting revenge for the humiliation he faced before, Takaoka calls up Nagisa for a rematch to their earlier knife fight. Despite Nagisa following Takaoka’s demand to get on his knees and declare he’s a coward, Takaoka blows up the antidote in front of the class, angering Nagisa, who picks up a knife in preparation to kill him.