There is not much difference between being alive and being dead. Either one is fine, anything is fine - Kuroo was living in such a world without color until he met Kazahana. By dating Fuka, Kuroo felt as if he had come to know the temperature of her heart, but an incident leads him to lose her. He is in despair in the world where he lost Fuka, he follows a mysterious cat and wanders into another world, a world where Kazabana is still alive. What if he had never met you, what if he had never lost you, what if he could have met you again...what if there was an “if” in his life?