Toaru Majutsu no Index - Volume 15, Chapter 5: Defeat the Person with the Strongest Black Wings. Dark_Matter.

A Consort seeks prosperity.A Shepherd cloaked in yellow wages war.A Prosthesis-wielder cries out for retribution.Shadows tremble in the depths, encompassed worlds obscuring the many dangerous secrets of history. Might they be unraveled, all ways of life would be threatened. But to climb higher requires risks, to seek the light requires a Gambit of Lifetimes.Only when one determines themselves capable of risking it all, can all prosper.

Sixty years after the global catastrophe, the Little Freeze Period ended, and the governments of the living regions began to collect land in the anarchic areas to be planned on a large scale, reorganized resources, and entered the recovery stage in an all-round way. These two decades are also called “golden Twenty years”.

This is a bright era in which new regions are rising one after another, politics is set up, capital is acting, careerists are everywhere, heroes are powerful, villains and grassroots are rising together! A young man rises up in troubled times with a full stomach of strategy, hides a tiger in his chest, and measures the world.

- Description from novelbuddy

Nagasawa crossed to Naruto Universe and was bound to Konohagakure.If Konoha is severely damaged and destroyed, Nagasawa’s lifespan will be reduced.He panicked at the thought of the upcoming Nine-Tailed Demon Fox's attack , and the thought of Konoha getting destroyed left him in despair.Fortunately, while bound to Konoha, he can obtain templates of powerful characters.At the beginning, He got the Whitebeard template! Since it's the Whitebeard from the Summit War of Marineford, he can use Tremor-Tremor Fruit's ability and Haki.Facing the Tailed Beast Ball, which terrorized Konoha Shinobi, Nagasawa leaped and shattered the Tailed Beast Ball with one punch!

Chu Qianze turned the pen in his hand in a circle and smashed it against the drum next to him, the loud drum sound resounding around him.

Facing the two people who looked over at him together, he pulled out a polite smile, which was very dazzling under the neon light.

“I’m sorry, you are ruining my eyes.”

Later:

Feeling the gazes of the people around him, the flashing lights that flared from time to time, and a few gasps, Chu Qianze’s mouth twitched: “Is this a new way to surprise people?”

***

Chu Qianze, who had just arrived in the world and was getting acquainted with his surroundings, was inexplicably pulled by a man and was held in his arms.

“I already have someone I like; it’s him!”

Chu Qianze looked at the person blankly, but saw that the other person turned his eyes away, his breath a little disordered.

“..?”

- Description from Novelupdates