Ayakashi Tsukai no Yome Sagashi

Ryuuichirou moved to the countryside in order to attend university, where he gets attacked by the handsome landlord, Akon Tenkawa. Akon says he's been searching centuries for Ryuuchirou and that they used to be lovers. Ryuuichirou has no memories of their past lives and naturally refuses Akon's advances and yet his heart!