One-Punch Man, Vol. 20

Right before the Hero Association's coordinated strike on the Monster Association's underground lair, the S-Class heroes hold a strategy meeting that quickly falls apart when Sweet Mask barges in. King's timely arrival steadies everyone's nerves just as the mission, split between an assault team and a team racing to rescue the kidnapped Waganma, finally gets underway.

Volume 20 of One-Punch Man sets the pieces for the series' largest battle yet, spending its early chapters on hero-versus-hero friction before the doors of the Monster Association's lair are finally kicked in. It is the calm, chaotic staging ground for the war that dominates the volumes that follow.