Amnesia

Amnesia - seme

Amnesia - seme

The uke experiences amnesia where he couldn't remember his past.

[BIG SPOILERS: As a child, the uke was very smart; with a high IQ. During high school, the uke planned to meet the seme where they were planning to travel together and elope(?), but the uke got into a motorcycle incident causing him not to remember his past and failed to meet with the seme as they have planned. His IQ dropped very low and became dumb (if I should say). The seme didn't know the truth until CH 38.]

The uke has amnesia where he can't remember his childhood.

The uke experiences anterograde amnesia where the uke can't remember any recent memories that he makes.

The uke lost his memories at the end of chapter 3, though I supposed he recover his memories during chapter 4.
-- He got amnesia because the birds told him that the actual adopted a white haired baby, who is him. He thought he was an actual god, where in fact, the God resides inside his body. He couldn't accept the fact that the mountain was neglected and him being the Mountain God didn't do anything about it. We can see at the end, the god actually left his body.