1st Anniversary Song Campaign (1周年記念楽曲追加キャンペーン) was a song campaign held during Project SEKAI's 1st anniversary.
Song list
| Release date | Song | Producer(s) | VIRTUAL SINGER ver. singers | SEKAI ver. singers | MV | Hint | |
|---|---|---|---|---|---|---|---|
| Japanese | English | ||||||
| 2021/09/29 | Saisei | Picon | Hatsune Miku | Yoisaki Kanade, Asahina Mafuyu, Shinonome Ena, Akiyama Mizuki, Kagamine Rin | 3D MV | No Hint | |
| 2021/09/30 | Gunjou Sanka | Eve | Hatsune Miku | Hoshino Ichika, Hanasato Minori, Azusawa Kohane, Tenma Tsukasa, Yoisaki Kanade, Hatsune Miku | 3D MV | No Hint | |
| 2021/10/01 | Roshin Yuukai | iroha(sasaki) | Kagamine Rin | N/A | No MV | 高音のシャウトが特徴的な、鏡音リンが歌う楽曲。 | A song sung by Kagamine Rin, featuring a very characteristic scream |
| 2021/10/02 | Lost One no Goukoku | Neru | Kagamine Rin | Hoshino Ichika, Hinomori Shiho, Kagamine Rin | 3D MV | その号哭は止まらない。 | The weeping can't be stopped |
| 2021/10/03 | MACHINEGUN POEM DOLL | cosMo@BousouP | Hatsune Miku | N/A | No MV | No Hint | |
| 202110/04 | Venom | Kairiki Bear | flower | Shinonome Ena, Akiyama Mizuki | No MV | めっ！ | NO! |
| 2021/10/05 | Haikei Doppelganger | kemu | GUMI | N/A | No MV | 少年は少年を失くして | The boy lost himself |
| 2021/10/06 | Telecaster B-Boy | Surii | Kagamine Len | Tenma Tsukasa, Otori Emu, Kusanagi Nene, Kamishiro Rui, Kagamine Len | Original MV | ま！❌ | MA! ❌ (Original images from music video) |
| 2021/10/07 | Tokio Funka | takamatt | GUMI | N/A | Original MV | 踊れやえびばぁでぃ！！ | Dance, everybody!! |
| 2021/10/08 | Akuma no Odorikata | Kitani Tatsuya | Kagamine Rin | Azusawa Kohane, Shiraishi An, Shinonome Akito, Aoyagi Toya, Kagamine Rin | 3D MV | 「神とやらに惑わされるなよ」 | Don't let god mislead you |
| 2021/10/09 | Dareka no Shinzou ni Nareta Nara | YurryCanon | GUMI | N/A | Original MV | 最初で最後の愛の言葉だ | My very first and very last words of love |
| 2021/10/10 | Marshmary | MIMI | Hatsune Miku | Hatsune Miku, Momoi Airi, Hatsune Miku | No MV | 逆らってゆくの！ | I'm going against it! |
| 2021/10/11 | Migikata no Chou | NoriP | Kagamine Len | N/A | No MV | 不協和音 | Dissonance |
| 2021/10/12 | ray | Fujiwara Motoo | Hatsune Miku | Hoshino Ichika, Hatsune Miku | 3D MV | No Hint | |
| 2021/10/13 | Hello,world! | Fujiwara Motoo | Hatsune Miku | Hoshino Ichika, Tenma Saki, Mochizuki Honami, Hinomori Shiho, Hatsune Miku | 2D MV | No Hint | |