i felt like yui's personality was a less fleshed out version of Masaki's from the Tadaima Okaeri series. This serious was published in 2014 & Tadaima in 2016 so there has been some growth in the author.
tbh, i'm honestly proud of both kou & shinobu's growth as characters. Shinobu distanced himself after getting hurt and did not forgive kou so easily. & Kou really reflected on his behavior, I can really see that he understood how much he has hurt shinobu.
i've never loathed a character in the first chapter as much as I do w/ Nana-chan.