Minazuki Rika , a girl who lost her only family, her father, to a strange illness and became lonely for the rest of her life.. As she loses her reason for living, a young man who claims to be the head of the Minazuki family appears and tells her a shocking truth.. "You and I are ‘ betrothed ‘." Rika knew nothing until this day.. About her father, the family rules, and the fact that the Minazuki family is the "descendants of the celestial maidens" represented in the legend of Hagoromo..