Koyoi, Ookami Kamisama to Keiyaku Fuufu ni Narimashite

Himari Niiyama had a secret she couldn't tell anyone: she could see beings that weren't human. One day, on her way home, Himari was attacked by a demon—a dead person who had turned into an evil spirit—and was saved by her gruff boss, Reiya Aizawa. Then he revealed a shocking truth: he was a half-demon, half-wolf god and half-human! "If things continue like this, the demons will target you again," Aizawa said to the frightened Himari, offering her a proposition in the name of a "contract." "I'll protect you. In return, become my bride."

(Source: Ichijinsha, translated)