Ayano Tateyama

First appeared in Transparent Answer. A cheerful girl who was Shintaro's classmate. During the summer of her first year of high school, she made contact with Shintaro, who had a tendency to keep a distance, but who soon relented to her advances and genuinely enjoyed her company. From then on the two became close friends. Shintaro catches her crying one day, but is at a loss at what to do and leaves. The next day it is revealed that she had commited suicide for some unknown reason.

(Source: Vocaloid Wikia)