The first place Nonoka Komiya ever called home as a child was Lake Kiriya City, and she's headed back. Sometime in the last seven years a mysterious saucer appeared hovering over the town, changing everything.

A group of friends-Nonoka Komiya, Koharu Shiihara, Shione Togawa, and twins Yuzuki and Souta Mizusaka-once attempted to summon a flying saucer to grant their wishes. After thinking that they failed, they called it a day. However, soon afterward, Nonoka abruptly moved out of Kiriya City, breaking the bond of their circle. Little did the group know, they were successful and the saucer has been floating in the sky since then, waiting to fulfill its purpose. Seven years later, Nonoka returns to Kiriya, all but forgetting everything regarding her life there. She meets Noel, a little girl wearing strange clothes, and through her, Nonoka begins to remember the past and the friends she left behind. From there, she strives to reforge her severed relationship with the others as she uncovers the mysteries connecting Noel, the saucer, and the wishes they once cherished together.—MAL Rewrite

It's been seven years since Nonoka Komiya last lived in Lake Kiriya City. However, while she knew that there would be changes in the town, she's still unprepared for what she finds upon her return: A giant saucer hovers over the entire city, as it has since shortly after she and her family left. Stranger yet, a girl she doesn't know, Noel, is waiting for her, claiming that they have met before. Confused, Nonaka tries to focus on reconnecting with her old friends, but odd memories, suppressed in the wake of her mother's death, begin to float to the top of her consciousness. Can it be that she has met Noel before? And how does this connect with the appearance of the saucer itself? To solve the riddle, Nonoka must join with her friends and rediscover the events that occurred before she left Lake Kiriya. Because there's more than a mystery that must be solved: there's a promise that has to be kept in CELESTIAL METHOD.—Sentai Filmworks

That saucer has always been in the sky... "I'm here to grant wishes." A mysterious saucer appeared in the sky above Kiriya Lake. When it appeared, the world panicked. But when it simply remained there, the terror disappeared. Eventually it became a tourist area, and people gradually lost interested. When two girls meet, it's a sign that things are about to happen again. A new story, where feelings change people.—Crunchyroll