Now, the curtain opens on an unprecedented story—— The night of New Year's Eve. There is a countdown party at the luxury hotel Babel. Dissatisfied with his own status quo, the fate of the rookie hotel keeper Kouta greatly changes by his encounter with mystery guests Ozaki and Naomi. And on the morning of New Year's Day, Kouta witnesses a world-changing moment—— With the Babel as the stage, and with a complex web of human relations, what is Kouta's mission?!