A Magical Girl Who Covers Her Tears with a Mask

In a certain era of Blue Star, strange things appeared. In order to resist the monsters, Blue Star condensed the Mind Stone, and used the Mind Stone to form a contract with the girls to fight against the monsters. Lin Yan's sister Lin Jia'er is one of them. However, while chasing the weird humanoid tentatively named No. 0, Lin Jiaer and her team members disappeared, leaving only her Mind Stone in her temporary residence. In order to find his sister, Lin Yan began to search for traces in the cities where her sister passed. However, during a battle against a monster, he used the belt and card made from his sister's soul gem to transform into a magical girl and defeated the monster. At the same time, he unlocked the magic seal left on the gem by his sister and got clues to find his sister. In order to find his sister and protect the citizens, Lin Yan chose to fight as a magical girl, but the result waiting for him was...