The way both Kenta and Kiyo's eyes sparkles when they hold each other's hands. It's very subtle, as subtle as that famous Japanese phrase "The moon is beautiful tonight", which is the translation to the English phrase "I love You". Then Momohana graduating as a Maiko and chose Kurokami, a heartbreak song, as her graduation dance. Thankful for her experience and saying goodbye to her first love. This manga's love story is very beautiful and subtle.
I disagree that Kiyo needs growth or a goal of anything like that. Kiyo is loving and living her life, making the best out of her situations. I think it's very realistic. A lot of people in their life ended up doing the job they're doing because of happenstance. Some are very lucky like Kiyo and end up really loving their job too.