Chizuko, who lives in Sakai City, Niigata Prefecture, is an otaku girl who is a big fan of the magical girl Berry Blossom who protects the city against the evil organisation Fossa Magna. However, nobody was worried about the battle of the two anymore because Chroma, the evil villain, was too lazy and weak.

So Chizuko decided “I want to make my magical girl shine more…!” That desire (?) leads the shy junior high school student down a strange, wicked path…
(source: Anilist description)