The Spiral of Sand (manga)

Haruka is in love with his best-friend Ryou who marries his sister. The day of the marriage he drinks too much and ends up staying in one of the room of the hotel where the receivement is done. In the night he is attacked and raped by someone who claims to hate him and that he'll never forgive him. Few days later at work he meets a new colleague and soon recognize in him his attacker. What is he doing here? What does he wants from him?