Mix-Sign: Girl with 3 Signs is an RPG game with a mix of adventure and thriller.
It's the story of a girl named Luna. She woke up in the park and discovered that she's gained the powers of the signs.
Luna will discover that she is not alone and that there are enemies who want to destroy people with powers, like her.

The enemies are the creatures of Mythologies and Legends, such as Manticore, Yokai, Hati and other known or unknown creatures.

In the park where Luna is, the noise of a scream appears and she decides to see where it came from. Arriving at the place, she meets Noah, a half human and half Harpy.
But all of a sudden, a Manticore appears wanting to attack Luna.

Later, Luna discovers that she is not the only one with powers. Other people have the powers of the signs at the of the Mix-Sign group base and there are good creatures. Luna will receive the missions to learn more about her powers, along with her Guardian, Adriel.