Mari Ayuki♀

Mari Ayuki is a student at Kashima high school and is a classmate of Hazumu's in their second year. As a child, she used to love watching caterpillars leave their chrysalises and turn into butterflies. However, she never once thought that she herself would want to be in a similar position—changing into something else—so she merely just enjoyed watching the transformation before her. That by itself is enough for her, she recounts to Hazumu. Using this as a metaphor, Ayuki tries to explain to Hazumu that watching her loved one from afar is its own variety of love, though Ayuki never explicitly states just who she admires from a distance. Ayuki is good friends with Tomari, and Ayuki will often give her, and others, advice and help in regards to relationships. Keeping with her stance on watching from afar, Ayuki continuously observes the ongoing development of the love triangle between Hazumu, Yasuna, and Tomari.

[From Wikipedia.]