One-Punch Man, Starting in Naruto

Naruto World

“Naruto, why do you keep getting smaller and cuter as you grow up?”

“I inherited the Otsutsuki bloodline. It’s not my fault.”

“Naruto, why is your body so tough, why are you immune to ninjutsu, and how do you have the Rinne Sharingan and use the Eighty Gods Vacuum Attack?”

“Hmm, you know Kaguya Otsutsuki? That’s me. You can call me Naruto Otsutsuki.”

“Then, Naruto Otsutsuki, is punching the entire ninja world to pieces also the power of your bloodline?”

“No, that’s my own power.”

Naruto Otsutsuki dominates the ninja world.

Demon Slayer World

“Rengoku Kyojuro, how did your arm grow back after it was severed?”

“It’s thanks to the Demon Breathing technique passed down by Kamado Tanjiro.”

“Rengoku Kyojuro, why are you still alive with only your head left?”

“That’s the power of Demon Breathing.”

“Don’t give me that! You’ve clearly turned into a demon, so why aren’t you afraid of the sun?”

“Because I’ve rejected humanity.”

Muzan and Tanjiro create the real Demon Slayer Corps. Just as the title suggests.