Mushi occurred ten years ago to haunt people’s dreams and grant their master with overwhelming force. Kusuriya Daisuke was in a transport destined to his college when Shiika attracted his attention. She was just a random girl but Kusuriya felt affection at the first sight.
He wasn’t aware the Special Environmental Prevention Bureau decided to finish Shiika as she secretly fleed from a supernatural installation lab of Japan. She is now considered to be a betrayer of the MushiTsuki band, so the most cunning spy Kakkou is recalled to cruelly kill Shiika.
Shiika and Kusuriya plan to celebrate Christmas together and imitate being happy though a fear that their secrets will be revealed doesn’t allow them to relax. This will be the most wonderful and catastrophic love story.