Spoiler Summary [Click to show or hide]:
OPM Manga chapter 37.7 gives us a hint that Saitama can also take damage, as the…
…police officer saw his hand bleeding after the fight with Lord Boros.
But the real story here is about a monster attacking the police officers in which Saitama came to help.
In One Punch Man Chapter 37.7, two police officers approach Saitama, informing him of a lurking danger. Saitama is taken to the police station for interrogation, where he explains his hero status.
However, the officers are skeptical, expressing distrust in the Hero Association.
During the interrogation, a delivery man transforms into a monster, threatening the officers. The monster, a former human arrested for drunk driving, dodges police attacks.
As the situation intensifies, the monster counters with a projectile, injuring officers.
The director calls for her assistance, but Director McCoy of the Hero Association shows reluctance. McCoy, frustrated with the police director, wants him to beg for help as the monster continues its rampage.
Saitama intervenes by snatching the phone. He volunteers to defeat the monster as a way to express gratitude for giving him a pork cutlet bowl.
Approaching the monster, Saitama performs a finger gun aimed at the monster. The media reports the monster attack on City Z police station, and footage shows someone carrying the defeated monster.
It was Saitama who wore a police costume and instantly disappeared after defeating the monster. The police director acknowledges the unknown hero who saved them.