Hotaru Hinase, a first-year high school student, witnesses Saki Hananoi breaking up with his girlfriend. Hotaru finally agrees to date him after he always helps her, even though she doesn't really understand love and romance.

After being left for dead, Denji turns into a devil-human hybrid with chainsaw powers, and gets recruited into a governmental devil hunting agency.

When a genocidal cult targeting Quirk users plants bombs around the globe, the Heroes must locate and disarm the devices — before time runs out.