Blue Journey is a subunit formed as part of the Blue Journey musical project for Hololive Production. The project will see a series of consecutive single releases over the span of 3 months. The songs are set to explore the listener's feelings and invoke a moment of introspection. The first original single for the project featured Minato Aqua, Houshou Marine, and Tsunomaki Watame. The second single features Sakura Miko, Houshou Marine, and Omaru Polka. The third single for the project featured Minato Aqua, Amane Kanata, and Yukihana Lamy. Blue Journey, along with its 23 participating talents, were announced to be signed to the label holo-n which was created in collaboration with Universal Music Group.[1] The fourth single, astro, was released on July 17th and featured Nekomata Okayu, Shirogane Noel, Amane Kanata.[2]