[Crossover] I Have an Umbrella

I have an umbrella that can stain blue robes with blood. Li Chongyun, female, is temporarily residing in Japan in this world to have her abilities assessed. Her starting mission is to make the Atobe Foundation, one of the Big Three, acknowledge her as a successor of Penglai. Her advanced mission is to stop the Red King Kagu Tsukudo from dropping his sword. Her side mission is to exorcise one hundred demons and take down an international organization of men in black. Her final mission is... to get into Tokyo University. Li Chongyun at the start: These missions all look pretty easy. Li Chongyun in her first year of middle school: Holy crap, are you tennis players trying to kill people? Li Chongyun in her second year of middle school: Holy crap, is this elementary school kid the Grim Reaper?! Li Chongyun in her third year of middle school: Finally cleared out all the monsters in Tokyo. Where's the next mission? Kanagawa? Li Chongyun in her first year of high school: ...You play tennis too, seatmate? Li Chongyun in her second year of high school: ...Blue King, Gray King, you're too late. I already took out the Red King. Li Chongyun in her third year of high school: Tokyo University is so hard to get into QAQ Why don't I have the brains of that genius, Munakata QAQ After it was all over, Li Chongyun spun the Yangwu umbrella in her hand and smiled faintly. Li Chongyun at the end: With all due respect, every one of you here is trash. Atobe Keigo: Ah, yeah? Yukimura Seiichi (smiling): Seatmate, want me to hit you with the Five Senses Deprivation? Kagu Tsukudo Genshi: I'm already dead. Habari Jin: ...I'm just a bystander. Natsume Takashi: Um... Li-san really is amazing. Natori Shuichi: ...Just passing by. Gin: I'm dead. Munakata Reisi (adjusting his glasses): Is that so? Li Chongyun: … Li Chongyun: I've already ascended. Please don't contact me. Interdimensional communication fees are expensive. Reader advisory: 1. Original female protagonist, absurdly overpowered and goofy, no romantic pairing. 2. The timeline and worldbuilding have both been heavily altered. 3. OOC, logic be damned, elementary-school-level writing. 4. Written for my own amusement, updates whenever inspiration strikes. The outline is the blurb.