3.5th Anniversary Song Campaign was a song campaign celebrating Project SEKAI's 3.5th Anniversary.
Song list
| Release date | Song | Producer(s) | VIRTUAL SINGER ver. singers | MV |
|---|---|---|---|---|
| ? | Electric Angel | Yasuo | Hatsune Miku | No MV |
| ? | Red Land Marker | Twinfield | MEIKO | Original MV |
| ? | Ai no Uta | Daibakuhashin | Hatsune Miku, Kasane Teto | No MV |
| ? | Garnet no Namida | Kashii Moimi | KAITO | Original MV |
| ? | Dandan Hayaku Naru | 40mP | Hatsune Miku | No MV |