The Crown Prince of Altaria-Oliver Button's Surgery is failed and he's passed away. Leaved his lover and the promise that make between him and his best friend. Kuon is always at Rena's side before and after Oliver's death. And he knew from beginning, that he always loved Rena. But he must keep the promise with Oliver to make her happy, and he promised himself that he will never falling in love with her. He will never be happy with her after he lost her from Oliver since beginning.