A Upper Moon Who Doesn't Want to Be a Femme Fatale Isn't a Good Jujutsu Sorcerer [Jujutsu Kaisen]

Case One: Once, I was an unremarkable Upper Rank demon. All I wanted was to "not be forgotten by time." My boss told me, "The hatred people feel when they face death is the most deeply rooted." I believed him without question and followed his instructions to the letter for hundreds of years, until one day I had a sudden thought: what if I reversed the two? Oh, nothing much happened. I just transmigrated. Then the System told me the times had changed. Whatever. Does it matter where I complete my goals? Blurb Two: With the System's patient guidance, I cleverly and calmly worked my way toward completing my little goals. Including, but not limited to: Checking in on a possibly blind 190-year-old child and getting his attention. Brushing the hair and tying a little ponytail for a Jujutsu Sorcerer who might not have any eyes. Pretending to be a gentle, understanding flower and winning over the lonely heart of a left-behind child. Tricking a runaway kid into working for me for free. Intimidating an elementary-school detective who was already an adult, then making my presence known in front of his girlfriend. Becoming the responsible, good teacher who came closest to being "hope" in my students' hearts. Becoming "someone from that organization" in the mouths of a certain executive and a scum boss. I really am a good person, even kinder than those kindhearted Russians. Blurb Three: I used a bunch of secret identities to fleece a lot of people. It was great. But why does everyone think there's some shady organization behind me? A few important points: 1. The pairing hasn't been decided. Feel free to pick your favorite. 2. A crossover with Jujutsu Kaisen, Bungo Stray Dogs, modern-day Demon Slayer, Danganronpa, Detective Conan, and others. 3. There are secret identities, but they aren't the main focus. 4. If the heroine makes you angry, hit X and spare us both. Theme: What you can't forget will surely echo back to you.