Author used two writing techniques that I don't see often:

Decoy Protagonist

Unreliable Narrator

It was alright, everything got explained at the end. Didn't think there was any actual plot holes, but if you missed any clues it could seem like there were some. Some reasoning was a bit weak at the end, though.

One particularly important early clue was when

Kenta destroyed a memorial to Sahara on the ground. This ends up being a big clue connecting to the reveal that Sahara didn't actually die. He had no reason to do that unless he hated Sahara, or he saw it as an insult to his old friend who wasn't actually dead.

The late story reasoning that I thought was weak was

when the parents decided to lie about their respective child's survival, ostensibly to protect others from having their hopes dashed if the child didn't survive treatment in the hospital.

can't someone spoil me regarding the ending of this manga. with flip-flop updates i'm gonna say this manga going to take very very long time to be complete translated. And i'll not shocked even this will be incomplete.
use spoiler code. ty

spoiler: if accidents are high at this crosswalk then the speed limit should be slow just for the school area...like in north america.