Daiichi Uchuu Sokudo, also known as First Astronomical Velocity, is a fictional idol band featured in the multimedia project 'Stella Jogakuin Koutou-ka C³-bu' and the game 'Houkago no Pleiades.' The band is comprised of characters from the 'Houkago Tea Time' series. The project blends music and anime, emphasizing the group's energetic performances and space-themed imagery.