Shirou builds a life where Miyu is just his sister, not a weapon. The Ainsworth family burns that down in one afternoon. What hits is watching him realize that loving her and keeping her safe were never the same thing, and that some people will always be hunted no matter how normal you try to make their life.

Shirou has built a quiet life with Miyu, a girl pulled from the wreckage of a destroyed city. His adoptive father warned him she is too dangerous to be anything but a tool or a weapon. But he refuses to see her that way. He treats her like family, like a sister who deserves a normal childhood. That peace shatters when Shirou lets his guard down and Miyu begins attending school. The Ainsworth family and their agents move in and abduct her, intending to sacrifice her. Now he faces an impossible choice. Rescuing Miyu is only half the battle. The real question haunts him: what do you do when someone you love is also a catastrophic force? Her potential for good is matched only by her capacity for destruction. Saving her from her captors won't solve the larger problem of the threat her powers will always pose.