What could be more romantic than Christmas Eve on a cruise ship? That's what Kaname is thinking when her school decides to schedule a make-up class trip... at least, until Sousuke declares that he's made other plans. He'll soon find that he's needed, though, as the ship finds itself beset by half-hearted terrorists, killer robots in the hold, and worst of all-a wannabe hero who's seen too much Die Hard! With the specter of Amalgam hanging over everything, can Sousuke probe the mystery behind them, while also keeping Kaname safe from harm?