A mysterious "transfer student" shows up in a peaceful classroom at Holy Lance Academy. Their teacher announces that he is quitting because he won the summer jumbo lottery and continuing to teach would be stupid, much to the disgust and surprise of the students. It's suddenly revealed that the weird new student is actually their new homeroom teacher, Haganeno Ken, who wastes no time in saying that he is a hero.
Saiki Kusuo has a wide array of superpowers at his command, including telepathy and telekinesis. This might sound awesome, but, in Kusuo's experience, superpowers are not all they're cracked up to be. He tries to live a normal life, despite his annoying abilities.

