Reincarnated as Itsuka Shido: Collecting Spirits as Lovers - Chapter 140: Wagnaria

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.

He lived from BC to the Middle Ages, from the Renaissance to the Industrial Revolution, and from Cyberpunk to the Interstellar Age. He has been a king and a prophet, a knight and a nobleman, a versatile artist, a genius inventor…
This is a four-thousand-year human epic——
“To us four thousand years from now:
“Is the world at peace? Is famine extinct? Can people touch the stars? How long is the human lifespan? How far is the boundary of the earth? Human…do you remember us?”
——Excavated from Earth Age Tenth Century BC, Solomon Prayer Book.

- Description from novelbuddy

Corporate slave Alexander dies with only one regret—not finishing the fantasy novel in his hands. Fate has a twisted sense of humor when he awakens as Alexander Flamingo, the perverted villain destined to be expelled and killed in that very story!Armed with complete knowledge of the original plot and a mischievous “Harem King System,” Alexander plans to rewrite his fate. No longer the one-dimensional pervert of the novel, he'll use his future knowledge to manipulate heroes, seduce heroines, and rise from disposable villain to the true mastermind of this world.The system grants him power through every relationship he builds—but can this calculating reincarnator use his second chance to avoid his predetermined death and become the ultimate Harem King? One thing's certain: this story won't follow the original script.

All Raven ever wanted was a chance — to go to college, make friends, be loved, and live like any other girl her age. But dreams, it seemed, weren’t meant for people like her.As a scholarship student at an elite university built for the wealthy and privileged, Raven's life quickly spiraled into a nightmare. Surrounded by cruelty and entitlement, she became the perfect target. Their relentless torment stripped her of everything — her dignity, her hope, her will to live. She bore it all in silence, blaming herself even for the tragedy that tore her family apart. Despair led her to the edge of suicide, but fate had other plans.Ten years later, those same bullies, now living lavish lives of success and luxury, had long forgotten the girl they destroyed. But Raven hadn’t forgotten them — not one bit.With scars that ran deep and a heart hardened by pain, she returned — no longer the fragile girl they once broke. One by one, she would visit her tormentors, delivering her own brand of justice and making them learn that every cruel action has a consequence.Because this time, Raven isn’t the victim.She’s the reckoning!