This volume is a collection of three additional stories.
Story 1: The Ancient Sound of Water. The events tell how Haruyuki finally accumulated the points needed to advance to the second level and what came of it. Recommended to listen to after the first volume. (translation by Ushwood — with musical arrangement)
Story 2: The Sound of the Surf at the Edge of the Earth. Parallel to Haruyuki's battle with Dusk Taker in volumes 3–4, Snow Black, while on a school trip to Okinawa, also had to experience an unusual adventure. (translation by RuRanobe — without musical arrangement)
Story 3: Confrontation. A crossover with Sword Art Online, offering a glimpse of the battle between Kirito and Haruyuki. (translation by RuRanobe — without musical arrangement)