2.5th Anniversary Song Campaign was a song campaign celebrating Project SEKAI's 2.5th Anniversary.
Song list
| Release date | Song | Producer(s) | VIRTUAL SINGER ver. singers | MV |
|---|---|---|---|---|
| 2023/3/30 | Trash and Trash! | WADATAKEAKI (KurageP) | Kagamine Rin | Original MV |
| 2023/3/31 | Vampire's ∞ pathoS | Hitoshizuku×Yama△ | Kagamine Len | Original MV |
| 2023/4/1 | METEOR | DIVELA | Hatsune Miku | No MV |
| 2023/4/2 | Interviewer | kuwagataP | Megurine Luka | Original MV |
| 2023/4/3 | Watashi no Koi wa Hellfire | SLAVE.V-V-R | MEIKO | 3D MV |
| 2023/4/4 | Snowman | halyosy | KAITO | No MV |