Becoming evil makes you ten times stronger, but becoming a demon gives you hundredfold strength - Chapter 387 - 321: Killing to Protect Life, Cutting Karma Not People

What happens when a genderless Artificial Intelligence who is proclaimed as one of the worst in mankind's history travels back in time from the unreachable future to the modern day and makes himself a true living body?

High school student Misumi Makoto is called into a fantasy world by the god Tsukuyomi, in order to be a hero. However, the Goddess ruling the world isn’t as thrilled to have him there, and kicks him to the edge of the world. Tsukuyomi declares that Makoto is free to find his own way after Makoto is abandoned by the other Goddess.

How did he meet such a bandit-like man? He drags you away the second he sees you! And yet, the only thing he can do is try his best to set the boundaries between them.

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“Don’t you ever try to leave and reason things out. It’s futile. Yelling is also useless. This lao zi has already fallen for you and I shall make you mine.”

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“Be obedient and wait for me at home, so I can pamper you till the day I die.”

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“Running away? What about it?

You dare to run away again and this lao zi will spend his lifetime seeing you try.”

- Description from Novelupdates

In this world, orphans or just anyone without any hope for this world can apply to become a “walking target”. Their sole purpose is to be a practicing dummy for the students of the sect who train to become “Demon Hunters”. These students need “walking targets” to test their training on living, walking beings of flesh and blood.
In exchange, they will be provided with food & shelter.
Their existence value is lower than a slave, but if they manage to survive a few years they can receive a life long pension.

Xiao Han is such a “walking target”. One time he witnessed a powerful Demon Hunter disposing a demon. When the demon died, a fragment of the demon that managed to escape entered Xiao Han’s heart. No one saw that, and even Xiao Han himself only felt some discomfort for an instant.

But that thing in his heart soon gave Xiao Han visions, and the first one is of a cultivation method which allows Xiao Han to absorb damage to enhance his body. A perfect cultivation method for a “walking target”.

- Description from Novelupdates