Diabolik lovers x yui's little sister

What if Yui didn't go by herself to the mansion? What if her adopted little sister was with her?

8 year old, Sunako Komori is Yui's adopted little sister. Both her and Yui are close. There is a problem with Sunako. She's a little odd and does have tourette's.

Will Sunako be able to survive with her sister or will she just be another blood bag? Will Yui get jealous of all the attention Sunako is getting?