It follows Keith, Tsubasa's childhood friend and former lover who's still deep in mourning, and Kurage, an android replica of Tsubasa created a few months after his death by a company aiming to capitalize on his popularity. After a chance meeting, they realize that Tsubasa's "suicide" was actually a murder and resolve to find the truth together.
Their investigation only becomes more complicated when Kurage discovers that Keith is an immortal cyborg capable of regenerating, and that his scrambled memories might hint at an even deeper and more dangerous conspiracy.
[From Itch.io]