Sosuke Kaburaya is a detective struggling to make ends meet. While on a case, he happens upon Sara da Odin, a princess from another world who wields magical powers. Sara quickly adjusts to modern Japanese life as Livia de Udis, a knight from Sara’s kingdom, arrives to find her. Soon enough, both Sara and Livia’s positivity begins to rub off on Sōsuke and the neighborhood’s cast of characters.

After his parents' death, Naoto cares for his sister Suzu while living with their aunt. A new transfer student, Satsuki, arrives at his school, bringing dark memories and secrets that threaten their life.