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 | Unit | MV |
|---|---|---|---|---|---|---|
| ? | NEO | JIN | Hatsune Miku Hatsune Miku, Kagamine Rin, Kagamine Len, Megurine Luka, MEIKO, KAITO |
Ichika Hoshino, Minori Hanasato, Kohane Azusawa, Tsukasa Tenma, Kanade Yoisaki, Hatsune Miku | Mixed | 3D MV |
| ? | I'm Mine | halyosy | Hatsune Miku, Kagamine Rin, Kagamine Len, Megurine Luka, MEIKO, KAITO | N/A | VIRTUAL SINGER | Original MV |
| ? | Tengaku | Yuuyu | Kagamine Rin | Ichika Hoshino, Shiho Hinomori, Kagamine Rin | Leo/need | Original MV |
| ? | Manimani | r-906 | Hatsune Miku | N/A | VIRTUAL SINGER | Original MV |
| ? | Melancholic | Junky | Kagamine Rin | Minori Hanasato, Haruka Kiritani, Airi Momoi, Shizuku Hinomori, Kagamine Rin | MORE MORE JUMP! | Original MV |
| ? | Buta ni Natte Yeah Yeah | Neru | Kagamine Len | N/A | VIRTUAL SINGER | 3D MV |
| ? | Koi wa Sensou | ryo | Hatsune Miku | Kohane Azusawa, An Shiraishi, Hatusne Miku | Vivid BAD SQUAD | No MV |
| ? | (Not) A Devil | DECO*27, PinocchioP | Hatsune Miku | N/A | VIRTUAL SINGER | Original MV |
| ? | All I Need Are Things I Like | PinocchioP | Hatsune Miku | Emu Otori, Rui Kamishiro, Hatsune Miku | Wonderlands×Showtime | 3D MV |
| ? | Tsugai Kogarashi | sigotositeP | MEIKO, KAITO | N/A | VIRTUAL SINGER | No MV |
| ? | Kamippoi na | PinocchioP | Hatsune Miku | Kanade Yoisaki, Mafuyu Asahina, Ena Shinonome, Mizuki Akiyama, Hatsune Miku | 25-ji, Nightcord de. | Original MV |
| ? | Dear | 19 -iku- | ? | N/A | VIRTUAL SINGER | No MV |