Synopsis

Within months, humankind will face extinction brought by the impending collision of a comet. It’s during this time, in the year 2020, that three sisters—Ayane, Kanon, and Oto—begin living together in their hometown of Setouchi after their father’s passing. The youngest, Oto, is perplexed by the situation, while Ayane and Kanon have already experienced something similar having stayed with their father back in 1999…