In a distant land, the sun and moon are held in place by two special caretakers, the Guardian of the Sun and the Guardian of the Moon. During the ceremony to select the next two guardians, a timid faun named Mune is unexpectedly granted the title of Guardian of the Moon. Mune is woefully unprepared to handle such an important duty and soon causes a mishap that threatens the balance of night and day. Meanwhile, the disgraced guardian Necross seizes the opportunity to exact revenge by stealing the sun. Desperate to make things right, Mune embarks on a quest to rescue the sun with the help of a girl named Glim and the new Guardian of the Sun, Sohone.