Is There Some Yokai!?

(from ebookjapan):

Suddenly, a mysterious black-haired girl named Mil appears in front of Hideto. They both decide to embark on a journey together. Yokai are no more than a morning delight, and they encounter dragons and UFOs in a series of bizarre encounters.

A mystery world full of laughter, tears, and fear. A romantic comedy adventure full of fun and excitement.