When Sora and Riku Sakuba are killed, they both find themselves reincarnated into a new world. Vowing to reunite together in the new world, the two former siblings learn there is more to the two of them than what they originally thought.

William signed a pact with Akane and Aoi. What’s the cost? Well, it’s definitely not a normal adventure. Who and what they will meet in theirs adventure?