Himeno is a sweet, shy little centaur girl. In her world, everyone seems to be a supernatural creature, and all her classmates have some kind of horns, wings, tails, halos, or other visible supernatural body part. Despite their supernatural elements, Himeno and her best friends, Nozomi and Kyouko, have a fun and mostly normal daily school life! (Source: MangaHelpers)

With the conclusion of an unforgettable summer break, Aoi Yukimura remains invigorated to continue pursuing her new hobby in mountaineering. Having braved her fear of heights and fulfilled her childhood promise with Hinata Kuraue, any opportunity to go climbing intrigues the first-year high school student—including a second chance to reach the summit of Mt. Fuji. Although the formidable yet exciting trip is planned for next summer, Aoi is already preparing as much as she can to guarantee her success this time around. However, as budding expectations blossom with the shift of the seasons, ascending the unexplored peaks of colorful endeavors begins to strain the bond between the two longtime friends and the perspectives they share of the future.

On a remote island far from the mainland named Urashima, a man washes ashore, with no recollection of his name or homeland. What he does recall, however, is that he is a time traveler with a mission: to save a certain girl from harm. As nightfall arrives, he meets Rinne Ohara, a girl who sings a tune that reminds him of a specific name—Setsuna—and decides to use it as his own. Knowing another "Setsuna" herself, Rinne takes him to her household as a servant, hoping that he is the same one she remembers. On the other hand, Setsuna continues to learn more about Urashima, desiring to identify his lost past. He comes to know about the island's folklore, its three great families, and the endemic disease that prevents anyone afflicted from stepping out into the daylight. As the mysteries of his missing memories and Urashima itself unfold, Setsuna must remember his purpose and fulfill his mission as soon as possible. But, as he witnesses the myriad of troubles plaguing the island, Setsuna begins to question—is his temporal displacement merely an effort to change a single girl's fate?