Soooo, I'm just gonna start rambling my thoughts out, so sorry if things get a bit disjointed.
What a rather disappointing story.
The premise was interesting at first, but the cast and execution felt just entirely subpar. Characters felt very shallow and surface level, while the protagonist gave me the impression of being essentially a mouthpiece by the author. Even the halfway point that essentially served as a protracted epilogue/third act didn't really so much develop the characters, but instead just emphasized how cliched and constructed by tropes they seemed to be. For a genre like drama and romance, where the complicated interweaving narrative is hoisted up entirely by the strength of its cast, this just serves as a massive failure point for me.
I saw someone put it as a wish-fulfillment story somewhere in the comments here, and yeah, more than being a barely passing drama this manga felt exactly like that. "What if I was a gloomy boy in this manga, what do I say to the people who tormented me?" It's that kind of scenario come to life, down to the beat-by-beat melodramatic reaction to the verbal dress down.
I have to say, if you wanted to read a story, that, while having a different premise, still serves to hit the same emotional beats - I'd recommend something like A Silent Voice, instead.