Madman in Love, I'm Begging You to Feel the Same

I'll rape you as your fiance sleeps in the next room... If the two of us had our own world I wouldn't need anything else. Reiichi, a perfectionist who's a loner at work, and his senior Chiharu. Chiharu is the first person to accept Reiichi for who he really is, so Reiichi falls secretly in love with him, but soon becomes frustrated by Chiharu's fiance. Reiichi tries to suppress his feelings in order to preserve their relationship, but then, a certain event blurs the lines...