Diabolic Lovers

Yui Komori is an ordinary high school girl who lived with her father, who is a priest. She was happy with her normal life until one day her father was called off to work and she is not allowed to accompany him. Yui was given a certain address by her father and instructed to go there, saying the people living there are "relatives". Yui follows her father's orders and arrives at a mysterious mansion as the address had suggested. As she discovers what's in the house, she meets the six Sakamaki brothers who don't seem "normal"...