After the incident of the Dark Matter Thieves, the heroes have been working so hard in the eyes of public. With that, the Hero Association thought that the heroes involved in the battle against the alien require a rest, so they take them to a hot spring inn. However, there will be something that they need to solve during their stay there.
(Morning)
(Hot Spring Inn)
(Hallway)The heroes are in the hallway. They all look on the floor and sees Zombieman lying there, with a katana stabbed into his back and he is lying unconsciouss.
Bang: No matter how we look at this, this is way too much for a normal person to take out an S-Class hero.
Child Emperor: Yes. I suspect that the murderer is... *turn around* among us!
One Day Ago...
Everything starts yesterday. The heroes who participated in the largest alien disaster ever were invited for an overnight stay at a special hot spring inn made by Hero Assocation.
(Hot Spring Inn)
(Men Side)Bang: Ahh. The how water feels really nice.
Iaian: More than that, having an all inclusive retreat at a hot springs must mean the Hero Assocition is pretty generous, huh?
Lokky: They surely know what we need after a tough battle.
Kamikaze: But it seems like some heroes are mooching off of it.
Hyuga: Kaaah... It really good having a relaxing hot spring once a time...
Greed: Don't we have one back at home?
Lokky: At least learn to enjoy this moment, man.
Metal Bat: That's right. *turn aside* Why were you invited here when you guys did nothing during the fight?
Hyuga: *in mind* Though Saitama did all the work for us...
Flashy Flash: I had some other matters to deal with.
Metal Bat: You got something more important than defeating threatening aliens, man?
Flashy Flash: I don't need to waste my breath on you.
Bang: After the events, it was confirmed that these guys were also dealing with monsters in their own way. And further, they strategicqlly made sure that the situation did not require their immediate attention.
Kamikaze: I guess it was effective then.
Pig God: I was hungry, so I went home.
Watchdog Man: As long as I can protect my own town, that's good enough for me.
Flashy Flash: And I was exterminating monsters on my own, as usual. Don't compare me to the likes of you lazy types.
Metal Bat: *stand up* What did you say, you bastard?!
Greed: If you wanna fight, then just say so!
Metal Bat: I had to specifically skip out on my little sister's piano recital because of this shit!
Child Emperor: Now, now, let's just all get along at least for today!
Hyuga: Master-san, I thought I saw you in the battle too. Where did you go?
Tank-Top Master: *look down* My pride was hurt...
Hyuga: Huh?
(Women Side)
Even at the women's side, they can hear the guys' conversation because they're so loud.
Tatsumaki: Hmph. I could've handled those aliens all by myself anyway.

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One Punch Man: The Elemental Hero
FanfictionA man who died due trying to upperhand a criminal got a second chance to live. He was reincarnated into the world of One Punch Man, one of his favorite anime. As he continue his life there, he encounter with the character he knows and even the chara...