The debut song "Bansanka," released in September 2023, dominated the charts, reaching No.1 on Apple Music's ranking and boasting approximately 400 million views to date.


The album contains 15 gems, including "Bansanka," "Sakura Kimi Watashi," and "Hyururirapappa," as well as seven newly recorded songs and two CD-only bonus tracks.
The jacket is newly drawn by wataboku, who has created all of her previous artwork.

In addition to that, as the first pressing bonus, this album includes an A4-sized clear folder featuring the album "15" jacket design.

She is offered to participate Kohaku Utagassen in 2024.