This is Princess Sugar's debut title. Celina is the princess of Mellberg, a prosperous Western European nation, and has come to Japan to attend a regular school while hiding her true identity. As a distant relative of Yuu, she moves in with him. One day, Olivia, the princess of the resource-rich country of Marualand, is exiled to Japan following a coup d'état. She quickly attracts attention in the town and is treated as an honored guest. However, Yuu disapproves of her snobby attitude, having grown accustomed to Celina's presence. Celina then warns Olivia to stay away from him, declaring that he is her most precious person. Undeterred by the challenge, Olivia vows to make him hers.