My Hero Academia Season 4 Part 1 contains episodes 64-76 of the anime directed by Kenji Nagasaki.

The yakuza make their move with a new drug that nullifies Quirks, and a little girl is being experimented on to create it! Luckily, she runs into Deku and Mirio while they're out on patrol for their internship, launching them on a dangerous rescue mission with the pros. A grim future is set in stone, and only time will tell if anything can smash through it.