The Leangle system was developed through tricks and manipulation by Isaka, the Peacock Undead, who needed the sealed Spider Undead to complete it. However, as later revealed, the Undead was not sealed properly and thus manipulated his users for his own agenda. For Mutsuki to change into Leangle, he has to insert the sealed ♣A: Change Spider card into his Leangle Buckle and position his buckle in front of his waist. The belt then expands automatically around his waist. Mutsuki makes a motion with his right hand across his face and says "Henshin!", then manually opens a portion of his buckle. The buckle announces "Open Up!" at this point. This would also cause a violet projection with a spider image to come out before him. Unlike Blade and Garren's method of transformation (running into thei