For each member's birthday, a special version of one song featuring only their vocals is released. The songs are available for a total of five days (the birthday and the following four days).
List of birthday solos: (note that this list is out of date)
| Member | Song | Date |
|---|---|---|
| Akari | Kanaeru Mirai | May 30, 2016 (+2017) |
| Suzune | Kizuna no Polaris | June 12, 2016 (+2017) |
| Mei | BoyFriend | July 28, 2016 (+2017) |
| Yukina | Blue Moon | September 8, 2016 |
| Hinata | Kimi wa Lemonade | November 12, 2016 |
| Hotaru | School Disco | January 21, 2017 |
| Ayame | Distance | February 2, 2017 |
| Anri | Hatsukoi Cherry Blossom | March 1, 2017 |
| Akari | Sore Yuke! Otome no Mission | May 30, 2017 |
| Suzune | Count It Down | June 12, 2017 |
| Mei | Tiny little letter | July 28, 2017 |