Hiroshi grapples with the daily realities of sharing his modest apartment with the enigmatic snow fairy Ruri after her sudden emergence. Together with Youko and her brother Kotobuki, he examines the mysterious jar recovered from beneath the floorboards while trying to restore order after the earlier mishap. Ruri’s otherworldly presence soon sparks small wonders and mishaps that draw the group closer, prompting Hiroshi to reconsider what it means to welcome an unexpected guest into his life.