Nagisa risks it all in an attempt to take down the mastermind behind the biological attack on his classmates. After the dust settles, Koro Sensei gives his all to ignite summer romance between his students.

Turns out their English teacher Ms. Jelavitch has her sights on someone…and everyone wants to help her get her target—er, the man of her dreams. Then, back at school, one of the students defects from the 3-E ranks for all the wrong reasons.

How will they win him back before he inflicts irrevocable damage on them all…?!