Hey there ! Author-kun here with some more information about this fanfic !
I'm here to explain how Mui's amnesia works. I also decided to give the Reader Character amnesia, but not as bad as his.Both Y/N and Muichiro have trauma-related amnesia, but both from different reasons. Muichiro was a passenger in the car that got his entire family killed and by a miracle he only received a broken arm, a fractured leg and a concussion from the clash of the two cars, while he got to watch the rest of his family die tragically, painfully and very slowly in the case of his brother. His brain could not handle the trauma so it started repressing Mui's memories. He of course didn't forget everything which led him to having depression and as some of you may know depression or anxiety can cause amnesia so with this wombo-combo he forgets half the things he knows and can no longer recall 2/3s of his childhood.
On the other hand, Y/N has solely depressive amnesia, (I'm not going to spoil the fanfic and the flashbacks the character has) but it isn't as bad as Muichiro's. Yes majority of his childhood he cannot recall but his amnesia is more like the days all blurring together, not being able to chronologically pinpoint events in his life and forgetting things about people or tasks he is assigned. It will be an often occurrence to see him forget his homework or to set his alarm. That is because Y/N has depression and GAD, along with BPD. He is also neurodivergent and nd people (like myself) dont have the best sense of time, so that is what basically causes the amnesia.Hope you can have a better understanding of the fanfic after this A/N and that you will find this helpful irl too ! (:
-Sincerely,
Author-kun.

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Remember When? // T. Muichiro x m!Reader
FanfictionModern!au. Where Muichiro and Y/N were childhood best friends, but everything took a turn for the worst when Muichiro's family died in a car crash, making him move with in his uncles in a different city. The tragedy leaves Y/N all alone to reminisce...