A meeting was underway with the remaining demon moons assembled to the infinity castle. As Muzan left the meeting, the sound of a biwa string snap became evident. "Biwa Lady~ What was that?" Douma asked with a smirk. "A string snapped," Nakime informed. "Take better care of it," Kokushibo advised. "If someone were to be su-" They all paused as they sensed the presence of a new powerful individual, accidentally summoned from the sound of the snapped string. They all bowed, sensing immense power.