Ever since the misanthropic Dark Overlord Allen rescued runaway Charlotte, his secluded mansion has grown more and more lively. One day, he is shocked to discover by chance that it's Charlotte's birthday tomorrow. Everyone else brings her gifts, but he hasn't prepared anything to celebrate! With his dignity as a boyfriend on the line, he racks his brains for the best present ever—but something strange befalls Charlotte... What secrets lie hidden in her past and identity? Will the lovebirds finally muster up the courage to share their first kiss? What awaits them on their family trip to Ryugukyo, the mysterious snowy resort? Things come to a head with the schemers behind Charlotte's plight in this adventurous climax!