Chapter 24

Sea King (深海王, Shinkaiō) is the twenty-fourth chapter of the OnePunch-Man manga series.

Part 1
The chapter begins with a city alarm announcing that the disaster level of the sea folk invasion has been raised to Demon. In addition the citizens are advised to evacuate the city. The Sea King continues to walk through the city. Lightning Max is seen observing the Sea King from afar. The Sea King then suddenly appears behind Lightning Max and their fight initiates. During the fight is overwhelmingly one-sided and Lightning Max ends up losing. Puri-Puri-Prisoner comes in time to save Lightning Max from being crushed by a building. It is revealed that Sonic has followed Puri-Puri-Prisoner and Sonic thanks him for allowing him to escape. Puri-Puri-Prisoner becomes excited to fight Sea King after sensing the King's strong aura. The two then begin fighting while Sonic observes. Puri-Puri-Prisoner ends up using a taking a lot of damage and resorts to using his Angel transformation. However it is proven to be useless as the Sea King was still able to beat Puri-Puri-Prisoner. After Sonic and the Sea King have a small chat, they begin fighting. During their fight, it starts to rain. Sonic's speed seems to be too much for the Sea King.

Part 2
Sonic's fight with the Sea King continues, but the Sea King gets a noticeable speed, strength, and size boost. Sweet Mask is briefly seen on television, he tells the interviewer a little about his ideology about what a hero is in his mind. Sea King is later seen chasing Sonic and is able to grab him. However Sonic was able to slip through. Sonic then tells the Sea King that the next time they meet, it will be the Sea King's last. Sonic bumps into Genos while on his way to get his weapons. Before Sonic leaves, he tries to belittle Genos's hero career. Afterwards, the Sea King decides to go to one of the Refugee centers. He was able to effortlessly make a hole in one of the walls of the center. Before he could attack the people C-Class hero, All Back-Man, interrupted him. B-Class heroes, Jet Nice Guy and Bunbunman, and A-Class hero, Sneck, followed All Back-Man's lead soon afterward. The chapter ends with the crowd cheering for the heroes as the heroes prepare for battle.