Dungeon Battle Royale ~ Since I became a Demon King, I will aim for World Domination - Chapter 41: -42 Part 1

Her – a glutton without troubles or worries who crossed over and became a young fat chick with a deep vengefulness.

Him – a young master of the number one power; a two-faced man with elegance and charming, good looks; he is the chosen one of the former saint god and a man who will only bend his back for her alone.

This domineering crossover’s slogan is, ‘Don’t touch if it is this sister’s, put it there if it isn’t this sister’s!’

…watch how the Domineering Glutton and the Two-Faced Venerate Emperor create sparks as they meet and collide, stirring the whole Spirit Treasure Continent into turmoil, how they fall for each other and how they kill each other, how life and death severs love.

- Description from Novelupdates

In regards to the MMORPG Cross Reverie, Sakamoto Takuma boasted an overwhelming strength that was enough for him to be called the Demon King by the other players. One day, he gets summoned to another world with his appearance in the game. There, there are two people that insist “I am the real summon master.” Takuma gets slave-turning magic used for summoned beasts cast on him by the girls –

September 9th, 2023. A large black sphere manifested in the skies above all across the world.

No one knows how it happened or the underlying causes of it, but one thing is certain: it marked the beginning of the end.

One by one, human's began to awaken supernatural abilities, a new source of energy had come into existence on earth.

People's bodies became catalysts for this newly discovered energy, especially those who awoke these abilities.

Unfortunately for the Human's, it wasn't just their faction which was awakening these abilities.

The Vampires to awakened. Feeling threatened by the new power that the humans would have whilst also feeling confident in the new strengths of their own... The vampire's decided to wage war on the humans.

Our protagonist, Xavier Trigger, a young college student, was one of the many civilians who were caught in the middle of this war completely unaware of what was going on.

[You have died.]

An inexplainable notification message occupied the entirety of “MC's” vision

[Skill: Rewind has activated.]

'What's... Happening to me...?'

[Level 1: Return.]

“Hah... Hah... Hah...” He panted heavily as his eyes drifted open.

An ordinary youth living in the year 2050 in the Western calendar accidentally came to a fantasy world created by the collision of magical elements and supernatural technology at the other end of the dimension…

- Description from novelbuddy