Harry Potter: Eclipse. - Chapter 43:

In the year 2025, humans awakened with the ability to summon mighty beasts—capable of destroying terrains, breaking the laws of physics, and creating wonders limited only by one's imagination.But before these blessings came a curse.An alien face appeared from nowhere and threatened all life on the planet, leading to the greatest war in human history.In the aftermath, the human race and the alien race were forced into a shaky treaty that could be broken at any time.Years later, tests for summoning abilities began for the next generation. Those who awakened low-grade summoning would be thrown to the gutters, while those who awakened higher got to join great factions after graduating from the academy.Kairos Veyl, the blank, calculating student, pulled his hand from the massive crystal pillar and stared at the large beast before him.“This kid—he just got a LEGENDARY SUMMON.”A legendary summon? The greatest class of summoning. However, with this class came a risk one would have never guessed.

The dawn era after the end of the half century has gradually rebuilt the order, abandoned civilization, and is full of undivided violence and desire.
The noble and powerful pioneers are in charge of the city, and the evil and mad plagues are in the wilderness.
Pure human beings who cannot mutate are the weakest, dominated by the rulers of the pioneers, and are not as good as animals in the wilderness.
A purely humanized young man with a worldly experience has quietly entered the WTO, holding a three-foot long knife and a long-distance desire to boil in the world of purgatory. From the nameless name to the sorrow of the Supreme Court, the name of the black ride is resounding!

- Description from Uukanshu (translated)

There are times—far too many times—when you feel that uncontrollable urge to kill someone.For Kaya, this… this was exactly that moment.“Repeat what you just said?”She’d seen hell on the battlefield—second-in-command of a military unit, dodging bullets, dragging traitors by the collar, and coming out alive with grit under her nails.But nothing, absolutely nothing, prepared her for the sight of her spineless husband flirting with her own sister. Right in front of her.“I could never marry a barbarian like you. The one I... I like is Meera—”Blah blah. The same pitiful nonsense again.You think—what could possibly be worse than this?And then, right on cue, your idiotic sister chimes in, completely serious, “I just poisoned you.”Wow.BANG.Before anyone could even react, Meera collapsed.Dead.Her so-called husband gasped like a fish dragged out of water.“Y-you…”He dropped to his knees, staring at Kaya like he was seeing a monster rise from the dark.“You killed your sister?! How could y—?”BANG.Second bullet.Same spot.He dropped like a puppet with its strings cut.Silence....Just when Kaya thought her story had finally reached its bitter end, the universe—no, god himself—decided to throw in one last, ridiculous twist.“Wife… wife, didn’t you say you were gonna eat me? Why’d you stop?”A snake beast, ridiculously charming and glowing like some immortal fantasy, clung to her, eyes gleaming.Another voice interrupted.“Shut up! My wife wants to cuddle me now—”A sparrow beastman leapt into her arms, like that made any sense.“Hic… wife, don’t you want me anymore?”A panda-like beastman sat beside her, huge, sniffly, and wronged like a child abandoned at a festival.Sitting in the middle of all this, Kaya was absolutely dumbfounded.‘When the hell did all of this even start?’