I would have rated this a five if the three of them ended up deciding to turn their friendships into a relationship between them. Author missed an opportunity for all three of them to realize that they couldn't live without each other. It felt unfair.
The sad thing is all 3 of them realized platonically hey wouldn't but none of thought they could translate it into romantic. Though it could be cause Yuuji ws the only one who started with "as long as the one I love is happy and safe". Souma was very much torture the competition and Kanade was "oh no competition my world is crumbling".
I do wonder if the threesome became a thing would they fall in love with each other or would Jealousy destroy them.
Somewhat spoiler commentary of the cover...
The cover is actually so meaningful. Both the high schooler and the boss are looking at him, but he only looks at the boss, because in the end, the boss is the one he ends up with. His ex behind him isn't looking at him, but he has decided to let go of the past and he isn't looking back at that guy either...
i cried-