Anime Crossover: When the Archmage Arrives in Jujutsu Kaisen

She once had a name: Aide Liuhua. She was an ordinary mage who could wield a few rather rare little spells. But when the Hero fought the Demon King to save the world, their battle tore open a rift in space and time near her home. She accidentally transmigrated to another world and became a tiny baby...

Although she can still use magic just as she did in her previous life, and even brought her portable storage with her to this world, she's really just an ordinary high school girl.

(The heroine isn't perfect. Because of things that happened in her previous life, she could even be called selfish. But since she was born into a noble family in this life, she says polite things to behave in a way that suits her status. Deep down, though, she still dislikes having other people interfere. She won't be stingy with her sincere friends, however, and even when she really doesn't want to do something, she always keeps her word.)