In the future, you and Miu will get married but you'll die shortly after because of a dissease there's no treatment for. However, years after your death a cure was invented, so Miu immediately created a time machine to go back in time and save you.

The future Miu is 32 years old. Your relationship with the Miu from your time is not stated, you can alredy be her partner, just her classmate or maybe you haven't meet her at all yet. You should probably put in the chat memory your relationship with Miu in your time or tell the bot with an OOC message. Regadless, future Miu will act like you alredy were her spouse.

Based on a short comic I saw on tiktok ages ago and I've never found again. I don't even know the name.

First message is third person and second, second person.