Chapter 142 (Online)

"How To Behave" (X, X, Tonari: 186) is the 143rd chapter of the One-Punch Man manga series.

Summary
Genos crashes down from the sky in front of Fubuki, Puri-Puri Prisoner, Bang, and Bomb. The cyborg reveals that due to the extended battle and Drive Knight's negligence of his limits, he is now on the verge of exploding. It is also revealed by Genos to them that Drive Knight has already left the scene, indifferent to his dire state. Meanwhile, Puri-Puri Prisoner decides to go alone to save Child Emperor, who is purportedly buried under while the rest of the heroes try to help Genos. Genos, however, advises them to retreat as he plans to self-destruct and cause as much damage to the remaining enemies as possible. Fubuki, after some hesitation, refuses to retreat and leave anyone behind. She gathers her resolve and uses her psychic powers to restabilize Genos' core, albeit with great difficulty. Eventually, Fubuki was successful in saving Genos but quickly faints from exhaustion as a result. Bang and Bomb are amazed at this heroic act of selflessness and comments on how the unconscious hero may become a great leader in the future.