Hazuki Yamanoi

Hazuki Yamanoi is one of the five main characters, and serves as the series primary protagonist. He narrates the events of how he and four other boys became afflicted by an unknown condition that causes them to transform into a girls when it rains and how they now go about their high school lives as both boys and girls. As a girl, he goes by the name of Tsukiko Yamanoi and is also called Tsuki-chan. "Tsukiko" is supposedly his cousin, though they are the same person. He has a twin named Natsuki.