The Supreme Level Up System - Chapter 243 Contribuition

The protagonist of the collapse of the three former civilizations is Dr. Mei. What is the end of logic, the strongest brain, super intelligence, this is the story of the strongest scientist of Honkai with knowledge of the moon becoming the god of science!

- Description from novelbuddy

The most feared Assassin in the world died because of vengeance.

After a surprise call about divorce, she finds herself in a whirlwind of emotions with her estranged husband.Caught between her father's illness and the her husband's family's expectations, she faced a decision to part ways with her aloof husband.~~~~~Three years of marriage, her husband never came home.But she's happy with it - because she secretly worked as his private chef.During the day, she receives a high monthly salary from him, manipulated and at his beck and call.At night, she's his little wife alone in an empty room every night, enjoying his luxurious seaside villa.Brimming with money and leisure yet her husband never came home, she was extremely content with her life.Until he caught her and pushed her against the bed, “Mrs, you've had your fun, isn't it my turn now?”

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.