From Otome's Way:

Summary: One moonlit night, Detective Kusaka Daisuke of Tokyo’s Metropolitan Police Investigation Department, 1st Division, managed to catch some criminals red-handed in the middle of an illegal drug deal. Struck by one of the perp’s bullets, the detective sought refuge down one of the city’s many back alleys…and stumbled upon a beautiful blond boy. The boy’s eyes shone red, his skin unearthly pale like a porcelain doll. He called himself Luca, and against all logic, mysteriously aged into a young man before Kusaka’s very eyes! What will become of this chance encounter? Find out in this modern-day fantasy set in the bustling streets of Tokyo.