It's about how Kurama has a sister but his step-dad made her move out. She calls on the phone and ask for him and she ends up telling him who she is. She tells him to find two people(Who are these two people that Kurama has to find?) and make to where she was at. Will Kurama do it for her and will his mom and step-dad find out That she has returned?

When the Bladebreakers encounter their future children, they must help them find their way back in their own time before the government and old enemies destroy them and the universe.