Bloodlust Lovers: Strike the Blood

Would a vampire really reveal of what they are? Maren Tamaki Mikage sure as hell did. When she was fourteen. A kid was saying that she would get raped by one of her brothers like Melody did and Maren attacked him and drank his blood till he was unconscious. On the verge of death. She was expelled and then homeschooled. Melody, Tomoe, and Mizuki now train Maren to become the strongest being in the world.

Then the Lion King Organization recruits her to go to the Demon District to observe a man to see if he's too dangerous. Only under one condition, she brings her siblings with her. She goes, but little did she know, there was love involved with this.