An evening of the spring vacation.Mitsuki who is temperamental girl is entrusted with a "goose" from her father."Goose" was Taiki which is Mitsuki's fiancé who quit a school now and is acting as an adventurer together with his father which did not have communication for eight years!When the night comes, Taiki has come to become a goose by curse of a ghost. With a strange mystery and a bittersweet memory, every day of Mitsuki and Taiki begins, but...?