Girls are awesome.
The girl's character is very similar to Echizen Nanjiro in some aspects.
The girl's character is almost the same as Echizen Ryuya's.
The girl's tennis is even better than Echizen Ryoma's...
But girls also have a weakness, that is, they don't like singing. Remember, it's not that they can't sing, it's that they don't like it.
The girl was adopted by Echizen Nanjiro together with her brother Ryuya.
(The setting of this article: Longya is five years older than Ryoma, and the girl is three years younger than Longya, which is the same age as the third-grade princes.)