Carwyn and Akio are siblings, not by blood but related through adoption, and Carwyn doesn't want to do anything that might ruin that. However, when Akio comes in to her room one night, talking about her father's crypric desires for Akio and Carwyn, she is forced to rethink everything she has ever held close. What happens if she doesn't accept Akio as he father planned is a fate Akio would rather not meet... What happens when a social experiment becomes a reality for someone who never knew any better?