A continuation of the legendary adventure of adventurous Riko as well as Reg that are signed up with by their brand-new buddy Nanachi. With each other they descend right into the Void' treacherous fifth layer, the Sea of Corpses, and also run into the mystical Bondrewd, a fabulous White Whistle whose shadow looms over Nanachi's distressed past. Bondrewd is ingratiatingly congenial, however the take on travelers know things are not constantly as they seem in the enigmatic Abyss.