As Sukuna in Invincible - Chapter 60: Perhaps...

Ryouma Takuma, a 39 year-old man with a hidden past, finds himself in a strange white room. There the gods tell him that he has died and that they are sending his soul to a different world; a world where magic exists. After living alone for three years his gamer soul loses common sense and starts toward crazy routes.

"Locke transmigrated into an era where everyone had Battle Beasts. Daemons were rampant and humans were forced to build walls around their dwellings while depending on Beastmasters to keep those monsters at bay.

Aaron, a wildlife biologist, became a military strategist right after a global war between nations began.He never wanted to participate in the war but he had to, because he wanted to continue his studies on endangered species the moment the war was over, but to his surprise, everyone in his unit were killed, including him, and the next thing he knew, Aaron woke up in the body of a young noble having a similar name to his.However, he also noticed he had awoken in a world different from Earth.In this world, demonic beasts ran rampart with only one thought in mind, causing them to feed on anyone they see, be it humans, elves or even magical beasts as well.During his first encounter with a magical beast, Aaron awakened a system which allowed him to bond with magical beasts and to obtain terrifying abilities from these bloodcurdling magical beasts, so he used his experience as a wildlife biologist to help make it easier for him to bond with these beasts.However, Aaron also noticed he could evolve these beasts if their loyalty towards him had reached a certain level, so he vowed in his heart to grow strong enough to protect those he cared about in this world with the hope of living a happy, peaceful life where he'll be able to focus fully on his passion as a wildlife biologist.

You’d think seeing the future would give me a head start on surviving the apocalypse. I had it all planned—until everything I knew shattered when my husband sacrificed himself to save me and our son. Now it’s just me, my three-year-old son Leo, and my cursed gift of foresight that only seems to kick in when it’s nearly too late.I’m doing my best to keep us safe, to find food, to make some kind of plan—“Mommy?”I glance down, trying to ignore the tug on my pant leg as I focus on our supplies. “Not now, Leo. Mommy’s thinking.”“Mommy!”I sigh and finally look down. My three-year-old is standing there, clutching… I blink. “Leo, where did you get a knife?”He shrugs, grinning like it’s the most natural thing in the world.My heart stutters. “No, really. Where did you find that?”I try not to laugh. I mean, he’s three. Maybe he just—found it somewhere? But the next day, it’s a water bottle. Then, a tiny flashlight, somehow with batteries still inside.I don’t even know what else; he’s pulling things out one by one with the pleased grin of a kid who’s just figured out his favorite game.Well, we may just survive this mess after all.Now, if only the universe could have spared me from him. I don’t even know his name, but I know his type: tall, broad, and annoyingly handsome, with an air of calm control that’s out of place in this chaos. Ex-military, if I had to guess, with a voice that’s just as infuriating as his smirk. The man has a habit of showing up at the worst—or best—possible times, with a gun at the ready and secrets buried as deep as those bright green eyes.I mean, he’s probably useful, but I’m trying to keep my eyes on the prize here: survival.For Leo and me.Because, foresight or no foresight, nothing is guaranteed in this new world—except the fact that people like him are trouble.