Desidero's Links
Friends though they don't recall their shared past. Jinhai was trusted deeply and so Desidero cared for him deeply. Even if he has forgotten the past, the vampire sword still is fond of Jinhai and his calm demeanor. And in how well Jinhai tolerates his jokes.
Friend? Yes but no? Once upon a high school they were sort of friends but it was a rather one sided affair. Desidero enjoyed teasing and getting the snooty snoot riled. Overall, the vampire held great affection for Takeru, and did consider him someone of value.