One Punch Man Manga Chapter 42

Fubuki (Blizzard of Hell) arrives in Z-City with her B-Class team—Eyelashes and Mountain Ape—to recruit Saitama into the Blizzard Group.

At the same time, hero rankings update: Saitama rises to B-Class Rank 7, while Genos becomes S-Class Rank 14. Speed-o’-Sound Sonic appears seeking a rematch with Saitama but clashes with Genos instead.

Fubuki confronts Saitama at his apartment; when he refuses to join, Eyelashes and Mountain Ape attack. Saitama instantly defeats them, demonstrating the overwhelming gap in power.