Elf to Hitotsu Yane no Shita

Uesugi Kage is a second-year high school student who has been unable to find a new love because of a past love-at-first-sight. When the apartment in which she lives is to be demolished, she comes face-to-face with her landlord, Hojo, but.. A life of cohabitation between an elf and a high school girl with a 1,000 year age difference begins. (Source: Natalie.mu, translated)