Everyone around Huayu Ye (花语叶) expects her to grow up and become an adult, and she's lost the ability to keep herself mentally balanced. At the bottom of her heart, her childish self is still there, and still strong. One day she wanders into another dimension, a world where the light has been lost, and darkness rules. The people there exist as babies wearing only their underpants. The clothes they wear can be summoned as powerful fighters called "Spiclo" (Spirit Cloth). In this world, a battle was being fought between light and darkness... However, this battle between light and darkness in another dimension was actually the battle between hope and despair in Huayu Ye's heart...

Source: crunchyroll

This is the original 12 episode Chinese broadcast version that aired from 14.04.2018 till 07.07.2018. The 7 episode Japanese broadcast version, To Be Heroine, which has been edited to condense the original 12 episodes into 7x23 minute episodes, aired from 19.05.2018 till 07.07.2018.

AniDB | MAL | Wiki (en)

Prequel: To Be Hero
Alternative version: To Be Heroine