3rd Anniversary Song Campaign was a song campaign celebrating Project SEKAI's 3rd Anniversary.
Song list
| Release date | Song | Producer(s) | VIRTUAL SINGER ver. singers | SEKAI ver. singers | MV |
|---|---|---|---|---|---|
| 2023/9/30 | NEO | JIN | Hatsune Miku Hatsune Miku, Kagamine Rin, Kagamine Len, Megurine Luka, MEIKO, KAITO |
Hoshino Ichika, Hanasato Minori, Azusawa Kohane, Tenma Tsukasa, Yoisaki Kanade, Hatsune Miku | 3D MV |
| 2023/10/1 | I'm Mine | halyosy | Hatsune Miku, Kagamine Rin, Kagamine Len, Megurine Luka, MEIKO, KAITO | N/A | 3D MV |
| 2023/10/2 | Tengaku | Yuuyu | Kagamine Rin | Hoshino Ichika, Hinomori Shiho, Kagamine Rin | Original MV |
| 2023/10/3 | Manimani | r-906 | Hatsune Miku | N/A | Original MV |
| 2023/10/4 | Melancholic | Junky | Kagamine Rin | Hanasato Minori, Kiritani Haruka, Momoi Airi, Hinomori Shizuku, Kagamine Rin | Original MV |
| 2023/10/5 | Buta ni Natte yeah yeah | Neru | Kagamine Len | N/A | 3D MV |
| 2023/10/6 | Koi wa Sensou | ryo | Hatsune Miku | Azusawa Kohane, Shiraishi An, Hatsune Miku | No MV |
| 2023/10/7 | Devil Janai Mon | DECO*27, PinocchioP | Hatsune Miku | N/A | Original MV |
| 2023/10/8 | Suki na Koto Dake de Ii desu | PinocchioP | Hatsune Miku | Otori Emu, Kamishiro Rui, Hatsune Miku | 3D MV |
| 2023/10/9 | Tsugai Kogarashi | sigotositeP | MEIKO, KAITO | N/A | No MV |
| 2023/10/10 | Kamippoi na | PinocchioP | Hatsune Miku | Yoisaki Kanade, Asahina Mafuyu, Shinonome Ena, Akiyama Mizuki, Hatsune Miku | Original MV |
| 2023/10/11 | Dear | 19 -iku- | Hatsune Miku | N/A | No MV |