Spiral of the Sand, The (yaoi manga)

On the very same evening that his little sister and best friend are married, Haruka is assaulted by a mysterious, scarred man who swears vengeance for a past wrong that he claims to have suffered thanks to Haruka’s family! Can Haruka nail down the stranger’s identity in time to save his own skin… or will his hunt for answers send him spiraling into a vortex of pain and suffering?