Reign of the Hunters - Chapter 387 Discovery

“They say the eyes are the window to the soul.”But what if your soul isn't human?Yuki always felt different... too quiet, too distant, too aware of things that shouldn’t exist. But when a strange voice calls him kitsune under a moonlit sky, his world shatters.Awakening powers he can’t control, chased by shadows from a forgotten world, Yuki is thrown into a realm of spirits, mythic creatures, and ancient war.As his true nature begins to surface, so do enemies... and allies... with secrets of their own.This is the beginning of his awakening.And the mythos has only just begun.

A novel revolving around being transported to another world with an op system. The mc spends his day chasing skirts and doing missions to level up. A standard journey to the top with lots of girls from various animes and games with a twist of that gaming feel (hunting mobs, doing missions).

- Description from novelupdates

After transcending to a new world, Ye Xuan miraculously obtained the Swallowing System.