The Protagonist System - 340 Enemy Mine

Shiao Yi is an 18 years old boy from a war-torn future, he is badly injured while escaping his enemies and wakes up in a strange, old-fashioned world with no technology—only magic, swords, and monsters.He’s saved by a kind but mysterious knight named Dominic and taken to a stone fortress where people think he’s just a lost child.As he heals and tries to hide who he really is, Shiao Yi slowly realizes he may have ended up in another world.With no idea how he got there or if he can ever return, he must learn to survive, understand magic, and figure out if this strange new place could be his chance to live a real life—for the first time ever.

Arthur Morgan is an ordinary adult who ended up in the chaotic Marvel universe.He just wanted to be a discreet writer and make money from his books.It also has a 'cheat'.A daily login system.As the name suggests, whenever he logs in once a day he gains something from the system, ranging from skills to completely useless items.…One day, Arthur found a blonde girl passed out at the door of his house.“Why the hell is there a girl passed out on my doorstep!?”

300 years after becoming a Demon King, the war angel Ansel faced a serious problem during a certain expedition.

——His halo grew out once again.

Ansel picked an auspicious place that was definitely and absolutely unmanned, and while cursing, he simply and skillfully broke off the newly emerged angelic aperture.

This thing was growing out faster and faster!

When will his undercover mission end already?!

The demon realm was divided and ruled by three kings. Demon King Saros was forced to go on an expedition with his sworn enemy, Ansel.

One day, he noticed Ansel sneaking away from everyone.

Saros decisively followed him, and was shocked to find that his sworn enemy, another demon king of the demon realm, took off a horn headband and fake bat wings. As Ansel cursed up and down, Saros watched as he skillfully removed a cute halo from his head.

This irritable, easily angered guy who loves fighting; the type that was cute when he shuts up but could make even demons angered to the point of ascending to heaven the moment he opens his mouth…

..was actually an angel???

- Description from Novelupdates

What is the Law of Causality? When the preconditions are met, the corresponding effect is bound to happen. Su Xin, who activated the system, can awaken various Causality Law Superpowers.Concealment Prayer: With palms together, randomly teleport ten kilometers.Unyielding Dead: Resurrect for one hour after death.Other-Transformation: If you hold another person's item for more than ten minutes without being noticed, gain ownership of it.Self-Deception: Close your eyes for more than three seconds to enter a Stealth State.