Hiroyuki

A young Japanese rockstar, living in his parents mansion (a large Japanese apartment considered to be more like a suite) and on their money, he was yet another fling of the beautiful Chizuru. However, when his new neighbors moved in with their daughter Azumi Yamada, Chizuru quickly claimed him as her boyfriend. Hiroyuki, realizing that Chizuru has a crush on Azumi, but truly believing that she loves him, has formed a plan to seduce and sleep with Azumi, ruining her for Chizuru. (Wikipedia)