Mahou Shoujo ni Akogarete

gushing over magical girls - Hiragi Utena is a major fangirl of the magical girls protecting her city, so when she has the chance to become one herself, she leaps at the chance to join their technicolor ranks… but when she transforms, she learns she isn’t fated to be a daring do-gooder, but rather a villain on the side of evil! At first she tries to quit her new gig as the leader of the local baddies, but she quickly realizes she enjoys it and is a total natural at tormenting the magical girls she loves so much. With both a bang and a whimper, Hiragi’s journey as a magical-girl-tormenting sadist has begun!

(Source: HIDIVE)