The Wrong Way to Use Healing Magic - Chapter 57Vol 17.

In a world where strength reigns supreme and only the strong are revered, conflict and injuries are commonplace.

Have you ever seen exposing holy vein?

Durin Kesma is the third child of the Kesma family. He has three brothers and two sisters beside two brothers and a sister. It can be said that it was one of the worst that Dulin’s family was born at least for the generation.

- Description from Novelupdates

A girl who calls herself a demon appeared before a timid student named Fumio Kijima. The girl claims to be a campaign girl from the demon world and she gives him the ability to “summon a room” from nothing but thin air.

At first he doesn’t abuse his power and uses it as a convenient ability in his every day life. But one day he is bullied by his classmates under a false pretext and is made to suffer. In the past he would have wallowed in misery and cried himself to sleep, but now he had a power to call upon.

“I will make them regret it!”

Using his powers to summon his “room”, he begins his era of confinement and brainwashing to achieve his goals.