A subdued story about quiet grief. It includes probably the least cynical explanation for why aquariums exist that I've ever heard.
I love how Haine is portrayed. She has a crush on Yachi and wants to be a decent person, wants to be trusting and kind like he is, but can't help herself from feeling petty jealousy and distaste for Yuki--the object of his attention. This is a romance in the sense that romantic themes play a role, but the story itself centers more around Yachi coming to terms with his grief at the death of his grandmother and reaffirming the importance of his friends who are still alive. The story doesn't end on a romantic resolution, but instead on the idea that his grandmother's love will affect him throughout the course of his life.