The Ice Lord Prime Minister's Black-Bellied Wife - Chapter 6

Like most candidates, Zlatan's dream was a simple one. To pass the hunter's test, join a guild, hunt monsters and reach the A-class.Eventually, as he dreamed of, he achieved it hundreds of years later. Having sacrificed more than he could take in, using the most unthinkable and brutal measures, he became an S-class Hunter instead.Obtaining the Copper Flame back then after the Aura Awakening Ritual, that was his greatest flaw. Taking a span of 80 years to reach a D-class. Still, Zlatan Elmore became the most powerful hunter to exist.Falling on the battlefield against a Two-horned Dragon, he suddenly awoke as his 30 year old self. Given another chance at life, he didn't only have his memories but he's also given a Blank Scroll. This mysterious scroll doesn't only speak, its omniscient!

The world was once at war with 10 alternate worlds. This was known as the Concept War and our world won 60 years ago. All of this was concealed so no normal people are aware of this fact in the current time.

After the death of his grandfather, the high-school student Sayama Mikoto is suddenly summoned by the giant corporation IAI. He learns this world is headed for destruction due to the acceleration of the Minus Concepts. To prevent this, negotiations must be undertaken with the survivors of the other parallel worlds so their 10 concepts can be released.

And so Sayama is caught up in the final battle to clean up after the Concept War which left behind so much enmity.

When other people experience a body transformation, it is inevitably either male to female or female to male.

Me? I wake up to find myself transformed into two different bodies.

Both a male body and a female body, one conscience operating two bodies, all sorts of embarrassing moments.

Walking together normally makes other people think that I am sweethearts with my other-self, such sadness.

Also, the entire business of a hero rescuing the beautiful maiden, I call Bull.

I get slashed by a sword and my female body gets abducted, and he wants me to thank him?!?! Can it be less of a tragedy?

- 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.