No, Yatora Yaguchi is not in love with Mori, but he definitely feels a deep connection and affection towards her and her works of art.
Rather than love, Yaguchi feels deep affection and connection, maybe even admiration for his senior Mori. After all, she was the one who introduced her to the world of art. Her painting of a weeping angel deeply moved Yaguchi and it inspired him to pursue art even more, especially during the times when he was doubting himself.
Everybody, no matter the position, age, social standing, or profession has that one person they look up to. Someone who inspired them to be the person they are now, and maybe someone who’ll inspire them even more in the future. Yaguchi and Mori’s relationship kind of is like that. Blue Period is an anime that is not only about art, but it is about admiration and passion. Mori’s art was the first art piece that moved Yaguchi. It was even the one that urged him to chase after the one thing that he was actually passionate about.

Love is something that is immeasurable, but so are adoration and admiration. It cannot be comprehended, nor can it be compared. Yaguchi’s admiration for Mori is deeply rooted in the art that she makes. Every piece is symbolic of Mori’s whole person, and as someone who isn’t able to express himself fully to the world, Yaguchi finds solace in the fact that there are people like Mori who are able to see his personality through the art that he makes. In the same way, timid and shy Mori isn’t really someone who shows a lot of emotions or vulnerabilities, the only way she does it is through art. Seeing Yaguchi admire her art must have made her develop some sort of connection that is not love, but something else. Their relationship dynamic isn’t really emphasized aside from the whole “chasing after each other but missing every time” trope.
Though Yaguchi and Mori never really develop into something more than schoolmates and friends, their story is definitely worth the watch. Blue Period the Anime can be watched on Netflix, and it currently has 12 episodes.
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