Magika no Kenshi to Shoukan Maou - 5.1.2 — Strength, the Time It Should be Shown

Humanity has been gradually transported to the Abyss by a bored god to compete against other races and monsters.The problem is… humanity failed. In a last desperate push the strongest survivors chose a comrade to travel as far as possible back in time.

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

Surgeon Guan Ryo Is reborn in Naruto’s world! Enjoy his trip as he uses his knowledge of the story to find his path in this troubled world and eventually stand at the top of Konoha!

[The female lead in this story is explosive, the male lead is arrogant, there's a mountain of dog food (sweet moments), and it's a story full of slag-abusing and monster-fighting, with a double dose of pampering joy.]Ye Jiuliang was naturally cold and ruthless, with a fierce and wild approach to life. To the Ye Family, she was a calamitous lone star, and to the onlooking crowd, she was “Ninth Master”.It was said, no one was more arrogant than Ye Jiuliang; if she was second, no one claimed the first place.Irritatingly, in the eyes of Li Mochan, she was his little wolf cub, the little rascal that he, Li Mochan, intended to pamper to the skies.In the capital, it was widely rumored that the Li Family's Crown Prince could reduce people to ashes with just one look.And yet, this precious and aloof figure was actually teased by Ye Jiuliang, and it seemed even... blushed.**Upon returning from a business trip, Li Wuye cornered her in a dim stairwell, his fingertips sliding over her porcelain white neck, “How many little brothers are there?”Meeting his dark gaze, Ye Jiuliang arched an eyebrow, “Is Li Wuye in the mood to beat someone up?”“So what if I am?” Li Mochan narrowed his eyes slightly, “Feeling pity?”Ye Jiuliang held back a laugh and nodded, “The little brothers can't take a hit, can you go easy on them?”[In the private room where Xiang Tian and others were singing their hearts out, they inexplicably felt a chill running down their spines.]Li Mochan buried his face in her shoulder and spat out fiercely, “I cannot.”Those who dare to flirt with his wolf cub deserved a ruthless beating.