In the Nara era when the youkai were fine, a gentle and cute girl, Oisoume Taime, promises to marry Orosnake to help a frog that is likely to be eaten by Orosnake. Then, the maiden who avoided the big snake that came to the house by closing the door helped the crab caught by the grandfather by offering money and a kimono the next day. A big snake that came back that night broke through the roof and invaded the house, making Taime-chan a big pinch...!?

In the old days, there was still a shogunate in Kamakura. There was a powerful man who tried to borrow the power of the sea sword with the promise that he could eat as many humans as he wanted every fifty years, in order to keep his power lasting-time is now. Natsumi-chan, an outsider, is working together with the outsider children's darkness and Kidomaru to protect Kamakura from the swords and fight together today! Alternative blurb Natsumi, a self-paced high school girl, finds a long-haired beautiful young man lying on the beach at the 50th anniversary festival of Gaho Doji, and takes care of him. The young man's name is Kuroyami, and he becomes attached to Natsumi, but with the appearance of the Kagekoji family, the evil spirits of her spirit world, Natsumi's daily life undergoes a major change...