A Pure type 3rd year, Seira is a kind and cheerful violinist. She's good friends with Yumi.

In M's songs, Seira will most likely take the role of Honoka, and in Aqours, she will usually be Riko, though this is subject to singer preference on a song-by-song basis. This does not mean she needs to sound like either, only that she is likely to sing those lines.