I'm Immortal, Yet the Magical Girls Are Way Too Dependent on Me

[Orange] In an age when magical girls are bound by the ironclad rule that they must never kill one another, figuring out what to do with these criminals whose minds have been twisted by magic, whose combat abilities surpass those of humans, and who are completely impossible to restrain has become a painful dilemma. In the rebuilt New Tokyo, a veteran magical girl whose magic is "immortality" is active. Miss Yako is gentle, cheerful, and full of emotion, a beautiful girl seen as the "mom type." Even today, she offers the other girls a warm embrace. No matter what they ask of her, she responds with a smile. A puppy, an owner, a friend, a therapist, a nemesis, a teacher, or even a punching bag. "No, that last one is off limits." Miss Yako protested. As for the rest... after all, she really is the most dependable, kindest, gentlest senior. "I survived for everyone's sake," Miss Yako said as she plunged the tip of her blade into the chest of a delinquent girl who was hopelessly attached to her. That's right. She kept coming back to life, again and again, so she could kill everyone whose heart had been twisted.