Depending on the visual novel by DISKDREAM.

Yuuji can't deny it - he's infatuated with Satsuki. She's the midst of his every waking thought, the star of his every wet dream... There's only one large problem. Satsuki is his late brother's fiance. Now, 12 months after his brother's death, Yuuji is hoping your day has finally visit make his move, but a steamy night with Miki, the shy red-headed girl in the office, could change everything. Should he be around the girl he always wanted, or perhaps the girl who always wanted him?