Chapter 78

"Those Who Move In The Dark" (暗躍する者たち, An'yaku suru Mono-tachi) is the 78th chapter of the One-Punch Man manga series.

Summary
While Speed-o'-Sound Sonic is training in the forest, he is attacked by two unknown assailants. They are revealed to be Gale Wind and Hellfire Flame, two upperclassmen from Sonic's ninja village.