A single-episode ONA, this is a conceptual opening animation for an imagined original anime starring Nijisanji members Ange Katrina, Inui Toko and Lize Helesta, the trio fans call Sanbaka. The project pictures a hypothetical world where the three share a story of their own, and the opening was produced alongside setting materials for that world. The premise frames it as a fresh tale for Sanbaka that crosses the line between real life and fiction, inviting fans to picture new sides of the three girls.