Agent of Seraphim - Chapter 23: Ruby

The human race is fending off the assault of the thaids, strange monsters evolved by animals occupying most of the earth's surface.

Because of the monsters, society has evolved into one based on individual fighting prowess; Erik is an abandoned young boy living in such society with the most useless of the powers.

Everything changes when his father returns home, bringing something he would have never expected.

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He rose from abjection and achieved eternity in glory.
He embraced the prettiest beauties and killed the strongest opponents.
He was able to shift the clouds into rain and cover the sky with one hand.
He could overrun the entire world and go anywhere as he pleased.
He pacified wars and held the world in awe.
He was matchless in the world.
However, his hair turned white overnight for his beloved woman and he was on the verge of death.
He was surrounded by enemies who were trying to take his life.
He struggled his way to become mighty and fought for everything he cherished.
For this age, he was the only king of the Dark World.
His name was a byword for might.
As a man living in the world, his only ideal was to pursue brilliance.

- Description from Novelupdates

Died while saving his dear friend and cursing the arrogant general, Leo gets reincarnated into a world ravaged by magical beasts.Here, strength speaks for everything, and the weak are killed at the whims of the strong. Leo awakens as the lowest-tier Beast Master. Just as he was thinking he would again end up under the command of some stupid general who was the reason for his death last time, he received a gift from a mysterious entity.[Primordial Beast Dominion system]Now, surrounded by people who see him as a weakling, his journey to grow the strongest has begun.Where everyone is beating their head to make their beast grow and unlock their potential, Leo uses the system to break his limiter and grow fast and surprisingly strong.With dual talent, a broken system and a yandere sister, he embarks on the journey to rise at the top of the food chain.

~My Lovely Harem School Life~Just like the cringy name suggests, it's a well-known dating sim that gained popularity due to the beautiful heroines, fun story, and most importantly, the significance of the player's choices that influence the endings....But why did I end up transmigrating into the scummiest character in the game, Yagami Reiji, the heir to the biggest Yakuza group in the country? The trash that harassed the main cast, the trash that bullied the students, and the trash that ultimately 'steals' the heroines if the player makes the wrong decisions.Why, God, Why!?Will my predecessor's past, a horrific mess, haunt me? Will my father, the King of the Underworld, accept me? Will the characters, now a reality, still hate me?I decided to live a regular life, slowly taking the steps to whitewash my reputation..... With an occasional punch thrown here and there......Wait, why is the original protagonist a complete idiot?