Misuzu lost her mother at a young age. In the summer of 2023, a girl visits Misuzu on her 16th birthday. It was her 16 year-old mother, Yoko. The “Tanetsumi Ritual” is held in the “Land of the the Eternal,” where the gods reside. Yoko, who was chosen as its priestess, tells Misuzu that she came from 1996 to invite her to be a companion on her journey. The Tanetsumi Ritual” is a funeral of gods, which is necessary for the immortality of the gods to pass between generations and into a new age. The “Tanetsumi Priestess” goes around the Land of the Eternal with the duty of convincing the leaders of the old gods to accept death before the “True Winter” that defiles the earth arrives. Invited by Yoko, Misuzu goes to 2050, where Misuzu’s own 16-year-old daughter Tsumugi joins them and they head to the Land of the Eternal. Together with Hiruko, who appears to be a pilot and introduces himself as Misuzu’s younger brother, the four travel through poetically-inspired lands where True Winter approaches. What outcome awaits Misuzu and her miraculous gathering of companions at the end of their time travel journey…?