I Reincarnated as an Extra in a Reverse Harem World - Chapter 82: Resolves.

Nanaya traveled to the Naruto world and survived the Uchiha genocide incident.As long as he sleeps, he can become stronger and invincible.After accumulating 60,000 hours of sleep, Nanaya opened the Sharingan and activated the ability of the Ice Fruit.Itachi: I didn't find his existence on the night of the extermination. Who is it?Sasuke: Nanaya, my Amaterasu's black flames can burn all visible objects, otherwise they won't go out.Next second!“What, Nanaya, you guy, actually froze my black flames.”Pain: That guy just slept for a second in the gap between Shinra Tensei, and the power to wake up is above me.Madara: I can't dance in front of that man.Kaguya Otsutsuki: My world of ice can't even live up to that sentence, ahhhhh!Uchiha Nanaya, with a pair of Mangekyo Sharingan, changes the past and reverses the future.

With a square halberd in the palm, and a red rabbit and horse under him, nowhere can the world go!

- Description from novelbuddy

Due to a mistake on his student’s part, a super Martial Artist had received a wrong class in an online game and had become a mage. He who was used to curbing violence with violence and using strength to subdue strength could only make the best out of his mistake. Taking on a new lease in life, he became a violent close combat mage. When strength and magic came perfectly together, a new gaming path had been opened by him!

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“Fireball spell? Lightning Chain? Frosted Ice Mirror… etc.”

“Wait, I came here to practice Kung Fu! What has magic got to do with me?”

“I am a mage?”

“Oh, that’s right. I am a Mage!”

“However… do you really firmly believe that I am a mage?”

“Alright then, look at my knives! Look at my sword! Look at my fist! Look at my concealed weapons!”

“What? You’re now saying that I’m not a mage?”

“If you don’t believe me, I will prove it to you: If you believe me, I will show you a performance: No one can get in the way of a mage who knows Kung Fu!”

- Description from Novelupdates

This is a very interesting thing. It is obviously dim and black, but it can emit a golden light, which makes people deeply fascinated by it…

- Description from novelbuddy