When Ai Nakahara first met her upperclassman, Michiru Kurosawa, she was already terrified by the latter's impressive fighting skills. There are also all kinds of weird rumours floating around the school about Michiru or (as Ai's classmates refer to her) 'Miru-senpai', one of those rumours being the fact that Miru absolutely despises girls or having anything to do with them, despite being a girl herself. However, after being helped by the older girl on their first meeting, Ai is convinced that there's more to Miru than what meets the eye.