Spoiler Summary [Click to show or hide]:
OPM Manga Chapter 61.5 gives us a two-part bonus episode about Saitama on a mission…
…with a team to capture a specific monster and Metal Bat’s past one year ago.
In this special chapter, Saitama and King relax by watching a T.V. show about a group of rangers called Zoomen. Genos enters the room, delivering a letter about a special mission from the organization.
Cut to the H.A. headquarters, heroes are briefed on a mission to capture a specific monster alive.
The team, led by a powerful hero with a Pile Bison weapon, sets out to a forest to capture the monster. However, Saitama suggests a team name, which is quickly voted down.
As the team sets traps, Saitama gets distracted by a vending machine, causing some tension. They discover a huge footprint, and Saitama notices a hole in the vending machine.
Back at H.Q., the director at H.A. discusses the monster’s price tag, reclassifying it as a Threat Level Demon.
In the forest, the team encounters the larger-than-expected monster, Urokodon. Despite teamwork, the monster wholly swallows the heroes.
Saitama arrives and, after a brief conversation, gets eaten by the monster, too. Inside the monster’s belly, Saitama one-punches it, saving everyone. The scene shifts to him playing video games with King.
In the next bonus manga scene, Metal Bat’s promotion to Class S is depicted, and Saitama requests an epically strong bat from the H.A. as a weapon.
The chapter concludes with Metal Bat and his sister, Zenko, holding flowers while walking after Zenko’s piano recital.