This is the story of the battle between the Gandeat, a group of vicious modified criminals, and the countermeasure team, SIGNAL, in the near future. Shirane Rikka, a genius doctor at SIGNAL, is troubled by the reality that dealing with crime every day is all he can handle. Then, he…

The protagonist, who has the power to make friends with monsters, challenges various labyrinths with his partner and his beloved monsters. You can choose a partner from three different characters.