RPG Covenant of Solitude is a full version iPhone game developed by Kotobuki Solution Co. Ltd. The game is set in a world where only a few people possess the power to commune with monsters and control them at will. Fort, a youth living in an orphanage in Listy village, has the genies' blood and is persecuted by the other villagers. One day, the Empire invades and the streets run with the blood of innocents. Running to the aid of his friends, Fort is forced to confront the truth of what he is and cursed by his own blood.

The game is a tale of trust and betrayal, friendship, love, and hate, all tangled together in an unforgettable story of lives changed forever by the blood of the genies. The genie's power to command monsters is a unique feature of the game. Fort can contract with monsters, including members of the four tribes of Dragons, Fairies, Beasts, and Vampires. Players can create characters by choosing a class for each of Fort's monster allies, then combine the strengths of each tribe and class to create a powerful party. Furthermore, the purchase of Solitude Points allows players to add various new elements to the story, including useful items and secret dungeons that are only accessible through Solitude Points.