MTL - This Option is Fantastic - v4 Chapter 259 The ultimate collision, the ancestor of the abyss

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.

Some crowns are forged in blood. Others are drowned beneath it.In a city strangled by smoke and silence, where children are shackled to machines and shadows rule behind gilded masks, Keiran is just another forgotten soul—until the mark appears.Buried beneath the factory’s foundations lies a world long erased from history. Ancient oaths whisper through stone and water, and something older than memory begins to stir. As Keiran is drawn deeper into the abyss, he uncovers a legacy not meant for mortal hands—a crown shattered in defiance, a flood sealed by sacrifice, and a power that demands a price.Hunted by tyrants, haunted by echoes, and bound to secrets he never asked for, Keiran must choose: drown in the tide of what came before, or rise against the current and reclaim what the world was forced to forget.But the deeper he goes, the more the truth unravels…And beneath it all, something still breathes.

Another entry in what you can call the Proto Harem Series: the books written before the Harem Series that take place in the same world.

It’s about a swordswoman whose student is captured, so she goes to rescue her.

Jiang Xichu was Chen Man’s secretary for many years. There was an inevitable dispute in the workplace. On this day, she just had a big fight with Chen Man. Before she passed away, she was stabbed to death by a psychopath who retaliated against society. Not long after her death, Jiang Xichu learned from the civil servants of the underworld that Chen Man didn’t feel guilty and had embezzled her well-deserved salary. Even her funeral was held casually, her colleagues weren’t able to attend and give their condolences. She goes back into the world full of anger and was ready to frighten the heartless woman, Chen Man. When she arrived at Chen Man’s bedroom, she saw Chen Man held an urn full of her ashes, while slowly looking at her pictures when she was alive while looking haggard.

A year later, Chen Man also died. The cause of death: suicide caused by severe depression. Jiang Xichu left Chen Man’s home with a complicated mood. She wanted to go back to the underworld and ask Chen Man about it. However, after stepping out of the home, she was reborn again.

Once again in the world, general manager Chen made her breathless.

Jiang Xichu: …

You little actress girl, you play your two faces very smoothly!

- Description from Novelupdates