A world set in the slightly near future. One evening, Iroha—a high-spec high school girl who loves taking care of others—picks up Kaguya, a princess who came from the moon. At the invitation of the energetic and unconventional Kaguya, the two decide to become Streamers in the virtual space "Tsukuyomi." As they deepen their bond through music, their fate begins to move—. This is a story of "Princess Kaguya" that no one has ever seen before.