The warmest of hearts is encased in a block of ice. Mina has to bond with a demon. In return for his permanent protection, she will offer him unlimited power. When she asks her best friend for help, Taurinus—a deadly assassin—arrives instead. Mina is horrified by the last minute substitution, but she is running out of time and has no other choice. She resigns herself to a passionless bonding of convenience… until one kiss changes everything.