Y/N, the son of the one punch hero Saitama, has teleported to another world after being sucked in by a mysterious portal that appeared. He ended up in a world of Spirits and girls in mech suits. Will he finally find a challenge in this new world or...
The city was currently in flames and in ruins. Around the area, a group of spirits were unconscious along with the members of AST. There were injured and unable to fight. The Fraxinus was crashed down with Shido and Kotori passed out. Y/N was pushed back by an opponent. He looked bloody and injured but he was still on his feet and determined to fight. Who he was facing was a demon that was slightly taller then him. Behind him was a girl with purple armor. She had a worried expression for Y/N.
Demon King: "Is that really the power you have? You humans are pathetic."
Y/N: "(Damn, this guy is tough but I can't quit.)"
Y/N: "I'm not done yet. In fact, I'm just getting started."
Demon King: "All of you are merely insects to me and deserved to be stepped on. This world is mine. Now die!"
Girl: "Y/N! No!"
He shot a large blast at Y/N with his hand and the area exploded. Smoke was covering the area.
Demon King: "That's the end of him. What?!"
One Punch Man Seigi Shikkou plays
He was shocked to see Y/N was still alive as the smoke was fading. He was still standing but his shirt was burnt off.
Demon King: "How can you still stand after that attack?!"
Y/N: "Because I'm a hero for fun! And this world is under my protection! I'll never lose!"
Demon King: "Puny human! Do you think you can defeat me?!"
He was about to step forward until the girl from behind stopped him.
Girl: "Y/N, don't do it. You'll die."
Y/N: "I can't let this monster destroy our home."
Girl: "But he's too strong."
Y/N: "I know that. I never fought anyone this strong before and I'm actually looking forward to it."
Girl: "What?"
Y/N: "This feeling. It's coming back to me! The exhilaration of a real fight! This is what I've been waiting for!"
Girl: "You can win this, Y/n. I believe in you." She smiled as she convinced.
Y/N: "I will. This will be the fight of a lifetime!"
Girl: "Wait, Y/N. There's something I have to tell you before you go."
Y/N: "What's that?"
Girl: "Wake up."
Music Stops
Y/N: "What? What did you say?"
Girl: "I said...."
Kotori: "WAKE UP!"
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