Hatsune Miku, Kagamine Len, MEIKO and Kagamine Rin were a part of the Sekai from the beginning. The remaining virtual singers were added in the following events:
- STRAY BAD DOG: KAITO
- Same Dreams,Same Colors: Megurine Luka
Hatsune Miku, Kagamine Len, MEIKO and Kagamine Rin were a part of the Sekai from the beginning. The remaining virtual singers were added in the following events: