A firefly that does not cry burns its own body.

Momose Aoi was in a romantic relationship with her senior. However, Aoi had recently been neglected by her senior. Then, she witnessed her senior being confessed to by a girl, and while she insisted she was his girlfriend, she wasn't believed. Told that if they were really dating they should be able to kiss, Aoi tried to kiss her senior, but he dodged her. Realizing she had been dumped, Aoi burst into tears. As she was crying silently, someone called out to her from behind. It was Kisaragi Toyo, a classmate and popular student...?