Mn, I don't like it.
Of course I like the plot,- but I don't like Kohei's character here.
He's acting like a Gadis Manja menggerutu; idk how to say that in English, mn..... a spoiled girl who always grumbles??!? (he's doing it with his eyes, + he also has a judgmental gaze).
He reminds me of Ji Hyun from Eight Sense

I'm so glad they made a remake because~
If this was the only adaptation of 'Hidamari ga Kikoeru,' I might never have thought to read the manga bcoz i think, this...... is..... bad.!
The series version, which is still airing now, is so good; they made it exactly like the manga.
We can also see how Kohei develops his feelings for Taichi. We don't get that in this film, and it's not because of the limited duration.
Here, Kohei looks like he was born- ummn Gay?
There is no state where he considers his feelings for Taichi, whether it is love, like pure friendship, or romantic love-love.?!
In Here, he seems like a man who has never received attention and love in his life, then immediately falls in love with the first person who gives him that attention.

Ah, And you're delusional if you think they have chemistry here.
Go to check Delusion by One OK Rock.