Chapter 111

 "Terrible Multiplying Bastard"  (増えるヤバい奴, Fueru Yabai Yatsu) is the 111th chapter of the One-Punch Man manga series.

Summary
Through the communication device, Child Emperor notifies the other heroes that he's rejoined the Surface Team and that the hostage rescue mission is successful. Mizuki is amazed with how Child Emperor is powerful and Sekingar confirms it. Child Emperor, not thinking too much of it, says it was a very close call. He then realizes there's no response coming from the communication device and asks if anyone can hear him but there's still no response. Worried if anyone got the message, Child Emperor then asks Sekingar if he explained to everyone how to use the communication device. Sekingar just says to give the heroes some time, thinking they probably can't answer as they're in a battle.

As he finishes speaking, there is a response from the communication device from Zombieman who praises Child Emperor for a job well done. Child Emperor is happy that Zombieman responded and in that moment, Sweet Mask responds too, saying that he will continue to carry out justice. The next hero is Pig God who, while digesting something, also praises Child Emperor and notes that nothing's out of the ordinary. The final voice that's heard in that moment is Atomic Samurai's. Atomic Samurai is confused as how to use the communication device, talking to himself, but then sends a message to everyone that he said they should listen to if they have time. He explains that he found a kid inside the base and Child Emperor is shocked. Child Emperor tries to talk to him, asking Atomic Samurai to describe the kid but is unable to as the transmission cuts off.

Child Emperor then glares at Waganma who is visibly scared. The other heroes then wonder what is going on, unsure if the monsters had captured someone else besides Waganma. Waganma starts to cry, telling them that he wanted to be rescued and that he's sorry. Child Emperor then grabs his backpack, saying he has to go and leaves Waganma to the other heroes. Sekingar then asks Child Emperor if he really wants to go as he's exhausted, telling him that the priority of rescuing Waganma has been completed and asking him if he would consider retreating. Child Emperor responds by giving him a deathly look, unnerving Sekingar and Needle Star then starts yelling at Sekingar that he doesn't get it, and that all lives are equally valuable. Mizuki then says that they should help too and the other heroes agree and begin walking towards Child Emperor. He refuses their help, however, saying it's not necessary and tells them that they should all stick to their assigned tasks. Needle Star then thinks to himself in awe about S-class heroes, and that he wants to become one too.

The scene then shifts to Atomic Samurai and Black Sperm talking to each other. Black Sperm gets angry because Atomic Samurai attacked him without warning, then scoffs Atomic Samurai's introduction. After Atomic Samurai said he had no business with him, Black Sperm grows a huge muscular arm and asks if he is looking down on him. Atomic Samurai answers his question with a "yes," before swiftly cutting the arm and mentioning that he's fought countless battles with similar bastards who can transform and shapeshift into giants, and that he's used to these opponents. A second Black Sperm then appears while Atomic Samurai gets annoyed. Black Sperm then asks Atomic Samurai if he still thinks he has a chance to win, noting that he's a countless number of "Black Sperm" merged into one entity and saying that no matter how many times he's killed, he'll keep multiplying. Atomic Samurai just rapidly cuts his heads in half while confidently saying he just has to shower the countless number of Black Sperms with countless slashes to win. Black Sperm continues to mock Atomic Samurai before Atomic Samurai slashes him into countless pieces. As the pieces begin to quickly surround him and regrow into new selves, Atomic Samurai just slashes them again. However, they just reappear, in ever larger numbers, jumping on him and getting slashed into more pieces until eventually, Atomic Samurai finds himself faced with a massive number of Black Sperm clones, trapping him on every side and telling him that it's over.