Aoyagi Ritsuka is 12 years old when his older brother Seimei is killed. Two years later, Soubi, a self-proclaimed friend of late Seimei, comes and introduces himself and tells Ritsuka that he loves him. Before Ritsuka has time to react, two children at Ritsuka's age, the Breathless pair, attack Soubi and Ritsuka, but Soubi easily fends them off. Soubi then tells Ritsuka his true name is Loveless, which causes Ritsuka to remember Seimei's true name, Beloved, which Seimei told Ritsuka just before he died.