Rui is a smart and professional thief, with a manner of communication in the form of flirting and teasing. But after meeting his investigator, Tsukasa, something seemed to change in Rui... Tsukasa interested the thief too much in his appearance, character and personality. Just the sight of it made Rui have a pulling desire inside, when he wanted Tsukasa to be always with him... The thief believed that Tsukasa was the most valuable treasure.