怪兽娘（黑）～奥特怪兽拟人化计划～

In the town of Soshigaya Okura, which is neither as bustling as a big city nor as leisurely as the suburbs, lives a high school girl named Satsuki Hiraga. While she admires the organization of monster girls known as "GIRLS," she leads an extremely ordinary life. One day, Satsuki awakens to a mysterious power and finds herself in confusion. However, the one who saves her is not the "GIRLS" she admires, but the evil army "BLACK STARS," led by a monster girl who calls herself Commander Black!?