Diabolik Lovers - 1x07 - Season 1, Episode 7- Followmy.tv

Yui is awakened by the sound of rain and looking down from her window, she sees a mysterious woman in a purple dress. She becomes controlled by an unknown force, and walks all the way down to a secret tunnel and enters through a door that takes her to the past. There she sees Ayato, Kanato, Laito, Shuu, Reiji, and Subaru as children. But after she discovers the truth of their twisted past, she reappears in the tunnel with a worried looking Ayato in front of her. And when being joined by Laito who was looking for some "fun" Ayato leaves shortly after saying he's had "Enough of this", and once again reappears looking down a balcony in deep thought.