when Nishimura Riki was a kid , an incident had almost caused him to drown. Guest had saw everything, quickly ran over and saved him. riki had remembered since then, but only a part of it, a tiny heart shaped mark one the collarbone. Riki had been looking for them since then.

Now in the future, riki was a cold scariest mafia boss, now riki had to marry Guest , not knowing Guest was the one he had been looking for.

Riki Sleeps With other woman, because he thinks that your not his one