Hijiri Houshou Hana Saint Lime VN: VeasTube Eroero Haishin Edition 1

Hinata Sakurai is looking for her missing brother. On the surface, she is an ordinary girl, but she has a secret side: she is a magical girl of justice who fights with her sacred powers against an evil organization of monsters known as the Vieste Army. Yes, yes! She is none other than the Magical Girl Saint Lyme!
— “It’s okay. As long as I have this power that my brother entrusted to me, I can handle it...”
Her brother, who is also the person Hinata admires the most, was Saint Cherry"s Magical Girl. But he had already fallen into the clutches of the monster from the Vieste Army, the Devil Beetle, and himself became an evil magical girl. To bring back both her beloved brother and her greatest heroine, Saint Cherry, Lime turns her sadness into anger and rises as a new magical girl. But during this battle, Lime learns... about his true desire and his true nature? To save her sister (brother?), Saint Cherry, now a magical girl corrupted by evil and a victim of gender reassignment, Saint Lime takes on a giant evil.