This Castlevania was removed from the series main timeline along with Circle of the Moon, Legacy of Darkness, and Castlevania 64. As of 2006, this is the only one of those 4 titles to not be re-inserted into the series canon. Add
Alucard, protagonist of Castlevania: Symphony of the Night, makes a guest appearance in Castlevania Legends...but not as a friend, rather as the Boss of Stage 4! Apparently he's Sonia's lover, and is testing her will before she confronts Dracula. This also seems to be a (sort-of) nod to Maria's testing of Alucard's will in the Sega Saturn version of Symphony Of the Night.