Michi is going to go through so much angst in the near future, it's not even funny.
The more I think about it, now that it's all but confirmed they loved each other at some point, there's no way for anything better than a bittersweet ending, right? After solving Aizawa's death/Michi's amnesia:
Either Aizawa has to "move on" so that Michi can live a normal life with healthy relationships, Michi dies/moves on to be with Aizawa (plot twist, Michi was dead but couldn't move on until she solved Aizawa's murder), or Michi becomes an old schizophrenic (to everyone who can't see spirits) dating her ageless ghost gf. Like, none of that is really ideal 😭