Fangs, Volume 3 (manga)

Since he became a vampire, En has been living with his handsome guardian and mentor, Ichii of the vampire health and welfare organization FANGS. But although the attraction between the two of them has become undeniable and unavoidable, Ichii still can't bring himself to share the painful scars of his past to the naïve and happy-go-lucky En. Even so, dark rumors are on the rise as a growing sense of fear pervades their vampire community. What happened thirty years ago? What does Ichii have to atone for? Who is the dangerous, powerful vampire who turned En... and why has he appeared before En and Ichii now?