Primordial Sin System - Chapter 483 -Hall of Chaos

One day, Yoichi who grew up while not knowing his parents has received the news of his father’s death. His father left behind a testament——which said he is to pick only one out of five ‘little sister candidates’?!

This is a world where humans, demons and mysterious beasts coexist.

Humans cultivate mysterious qi. Demons cultivate corporeal bodies. Mysterious beasts cultivate soul perception.

A legend says that in the middle of an endless rainforest, there are extremely powerful existences; they are called demon kings.

Some demon kings have a tyrannical corporeal body, some are experts in illusions.
Some demon kings are proficient in magic, some can even move mountains.
Some demon kings are able to sense things thousands of miles away.

These demon kings rarely appear in the human world. Even if they emerge in the human world, they would reincarnate in human form; assimilating with mankind while seeking to breakthrough realms…

- Description from Novelupdates

An Individual from Earth finds themselves in the Shinobi World, equipped with a Scientific System. From that moment, he delved into scientific research far ahead of its time.

[MATURE CONTENT]“Kiss or Kill?”“Karma.”*****Broken by a pack that was supposed to be home, Tamiko swore to never attend any mating ceremonies. He knew they would eventually reject him, so he didn't want to risk the heartbreak even more.However, a lonely best friend in need of a mate and a bunch of convincing later, Tamiko found himself at the entrance of the mating ceremony.As if that wasn't enough, the midnight moon gave him what he didn't want the most. A mate. But not just any mate. Gabe; the alpha's dark son, a man who made it his mission to make Tamiko's life harder, and also the man Tamiko hated more than life itself.As their eyes glowed in the night, Tamiko didn't see a mate, he saw a very rare opportunity; a chance to run, or be the one that Gabe ran from.He chose the latter.Like a gift from the moon, he realized the one thing that could burn down the Grealor pack.He bore the mark of lycan royalty, more precisely, King Zaffuto's mark.The outcast, Tamiko, was the lost lycan prince.