Street Sekai is Vivid BAD SQUAD's sekai.
It is accessible via the song "Ready Steady".
Kohane, An, Akito, Toya, Miku, Rin, Len, Luka, MEIKO, and KAITO have conversations here. Additionally, area items that increase the power of Vivid BAD SQUAD and VIRTUAL SINGER cards can be found here.
Areas
Main
The main area of the Street Sekai is automatically unlocked straight away and was previously the only visible section of the Sekai from the World Map. It contains area conversations as well as the area items shop where players can purchase and upgrade items that increase the stats of specific character cards.