It's about kanato and his other sister that he only knows about she looks just like her father Karl but with a little light purple at the tips and her eyes where the same as kanato

"You bastards you only come to me when you need something!" "Of course we do, you're only a blood bag." ". . .So. . .I knew I made the wrong choice to trust vampires." "We're vampires! Why would you trust us in the first place?!" "BECAUSE I THOUGHT I COULD TRUST YOU GUYS WITHOUT A DOUBT!!" "Tch, stupid humans, thinking it was a good choice to trust vampires." "Yea now I know my biggest mistake was, I hope you bastards find another blood bag cause I'm leaving!" "We're letting you leave because we are tired of you stupid mortal!" "Good! Bye son of a bitch bastards!" When she left through those gates, those 6 vampire knew. . .they messed up. . .

Shizu komori is yui's little sister. She is forced to go live at the sakamaki mansion with her sister. She is very frightened and starts to cry. Yui is always trying to calm her down and make her smile. Shizu doesn't know it but she caught the hearts of the sakamaki brothers! How will shizu handle this? Let's find out!