A mysterious blue-haired girl that appeared when Nonoka and her group of friends tried calling the saucer seven years ago. Later revealed to be the saucer, she's dedicated to making sure that the wishes of the people who called her come true, having a childlike sense of energy and curiosity, and always being cheerful.
- All-Loving Heroine: She's so sweet that she extends beyond just being a Nice Girl. With some major exmaples being the fact that she had no issue waiting 7 whole years for Nonoka to return, with her first instinct being to hug her when she returns in episode 1, aiding Yuzuki in her movement to get rid of the saucer in episode 4, knowing full well that she actually is the saucer, and immediately seeing Carol (the pink haired saucer girl in the 2019 ONA) as her friend when Nonoka asks about it. But her biggest moment of this is when she decided to visit the Hokubi festival that took place at Nonoka's school in episode 9 to not only be able to see the planetarium with everyone, but also to ensure that Nonoka and Shione are happy together, knowing full well that she'd get a Near-Death Experience from being too far from the saucer.
- Cheerful Child: Almost a textbook definition of this.
- Companion Cube: She is really attached to the monster sign outside Koharu's shop, apologizing to it when she falls trying to get her head out of it in episode 3, and when she breaks it in episode 7.
- Cute Clumsy Girl: She's prone to falling on occasion, most prominently in Episode 5 when she fell off the edge of a chair and bed while at Nonoka's house.
- I'm Crying, but I Don't Know Why: Happens to her seconds before she's about to disappear in Episode 11.
- Near-Death Experience: Happens in between the end of episode 9 and the beginning of episode 10 when she spends too much time away from the saucer.
- Third-Person Person: Is this on a frequent basis.
The main heroine of the series who returns to Lake Kiriya after moving away seven years ago, yet has next to no recollection of any the memories she shared with her friends there. She acts as the more mature one between her and her father, being the one who cooks for both of them and does house cleaning. Once her childhood memories are unlocked, she does everything she can to bring her group of friends back together and especially reconnect with Shione Togawa, the one who was hurt the most from Nonoka leaving all those years ago.
- Childhood Home Rediscovery: One of the many driving forces of the show's drama is Nonoka not remembering anything she did while she was in Lake Kiriya 7 years ago.
- Nice Girl: Barring some annoyances with her father, she's shown to be friendly to anyone she encounters, is willing to deal with Yuzuki's irrationality throughout episodes 2, 4 and 5, being especially forgiving by giving Yuzuki a small tap on the face when Yuzuki asked her to slap her as payback for what she did in episode 4, and does whatever she can to make amends with Shione as she feels entirely responsible for her becoming so cold and bitter.
- Signature Head Gear: Always wore baubles when she was 8 and wears a lopsided scrunchie in present day.
