(Anime Crossover) The Time Manager of Vengeance

She drifts from place to place, appearing and vanishing. What is her mission? Life is like a dream, half-awake and half-asleep. Where does she belong? She fights through blood and tears, laughing and crying. What, in the end, is her conviction? From the moment she agreed, her heart was already dead. She had no right to come into this world, but she did, so she has no right to love anyone. Why give up the happiness and beauty she once had for this unrealistic dream? Why doesn't someone like her just die? Her faith, her obsession, her resolve will never change, not for anyone. "What is it you're so determined to hold on to?" It is all for the happiness she never gave up on, but lost long ago. [Reader Advisory] 1: The heroine is very powerful, and this story is pure wish fulfillment. It was written during the author's late chuunibyou phase, so it's all fantasy and lacks logic. 2: The heroine is too powerful, so there is no romantic pairing in this story. It takes an ambiguous route instead. 3: The heroine defies science, and speaks in an over-the-top manner, using words like "you" and "I" in an archaic style. Feel free to poke fun, but don't throw bricks. 4: Like I said, this was written when the author was immature, so of course it's full of plot holes. Why are you making such a fuss? Is it really okay not to adopt a trash cat?