I only read some of the First chapter and i remember the mc sitting in a train as a kid staring and i Think looking at whats gonna be the Ml in the future and kinda Holding up his hands framing him with his fingers (like hes making a picture).
I Think MC May be in an accident when he’s a kid, or something similar was mention in the summary and it was a black and white manga (Japanese). And perhaps MC was a photographer.
Kinda sounds like https://www.mangago.zone/read-manga/kami_no_fune_de_nemuru/
Today… I should really go to bed but why this so good