Toaru Majutsu no Index - Volume 16, Chapter 1: From Peace to Ruin on the Proceeding Path. Battle_of_Collapse.

Earth is the human civilization’s cradle, but humans cannot possibly live within its cradle for eternity.In 2264, the first deep-space colonization spaceship of human civilization leaves the solar system and enters the boundless darkness…Zhang Yuan, son of the man behind the spaceship’s main control system, is one of the half a million volunteers to embark on the 20 light-year journey to a new planet.Follow Zhang Yuan on his journey of gaining new knowledge, exploring the unknown, and finding out what's the secret behind the intelligence enhancer his father left him.

Travel to the primitive world, open up wasteland and farm land, tame animals and fish, build houses…

Jiang Xuan wants to create a tribe of his own!

- Description from novelbuddy

Most people don't choose reincarnation.

Reincarnation finds their way to them.

Perhaps they did something great in their life.

Or maybe truck-sama wasn't looking where it was going.

But without fail, those who reincarnate are destined for something great.

A new life where everything changes for the better.

But...

Reincarnation isn't always the greatest thing.

Sometimes you just draw the short end of the stick.

Di Tou just happens to have drawn the shortest stick.

Pulled out of his life randomly.

Taken by a crazy old eccentric man not as a disciple, but as a body double?!

And a janitor body double no less?!

Grasping a system to find... It's a JANITOR SYSTEM!?

Truly, how unlucky can one get?

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In Japan of 1992, just after the economic bubble burst, society's public safety began to deteriorate. Xu Tianze finds himself transmigrated into the body of a detective named Aoyama Hidenobu, and the moment he opens his eyes, he discovers himself bound up tightly...Entering the new century, a prestigious magazine proclaimed that although Japan has lost a decade since the 90s, they gained a legendary figure like Aoyama Hidenobu.Regarding this, some Japanese nationals expressed: 'Damn it! We'd rather lose another 100 years than have this traitor to our country!'This book is also known as 'This Tokyo is Somewhat Hot.'PS: The protagonist is a rascal, acting with contempt, decisive in killing and fighting, purely for the thrill, not for the faint-hearted.