Ikeoji Majutsushi-sama to no “Jiko Chiyuu” de Mofumofu no Noroi ga Tokeru Hanashi

Miltia, who works as a receptionist at the Mage's Guild, has a crush on the guild master, Frey, but is troubled because he doesn't reciprocate her feelings due to their age difference. Then one day, she finds an owl on the roadside that looks exactly like Frey...!? (Source: Shogakukan, translated)