One-Punch Man, Vol. 18 continues where the previous tankōbon left off and contains the next three chapters (88–90) of the on-going manga series.
Bug God and Royal Ripper who were following Garou have passed their judgment and told Garou to kill the boy he’s protecting, because to become a monster – one must turn themselves from their humanity and protecting an innocent is not monstrous. Unwilling to kill the boy, Garou fights Bug God and Royal Ripper and was on par with them until he got distracted and was seemingly slain on the ground. Bug God and Royal Ripper leaves with the boy Garou has been protecting as hostage.
Meanwhile, the Hero Association hears about a child being kidnapped by the Monster Association and they decide to form a rescue mission and destroy the Monster Association at the same time. Meanwhile, the seemingly dead Garou gets up and heads to the Monster Association Headquarters to rescue and save the boy and managed to leave carnage of monster body parts in his wake – including Royal Ripper.
This tankōbon is written by One and illustrated by Yusuke Murata. For the most part, the tankōbon focuses on Garou and his relationship with the Monster Association. Although he has the powers of monsters running through his veins, he is unwilling to give up what little humanity he has left and fights to keep it, which means protecting the boy who had saved him many times. After a lot of dilly dallying, the Hero Association has finally made its choice and heads out to destroy the Monster Association once and for all.
All in all, One-Punch Man, Vol. 18 is a good continuation to a new series that seems really intriguing and I can't wait to read more.