As the other five brothers—Reiji, Shu, Subaru, Kanato, and Laito—emerge, the terrifying reality sets in: they are all vampires, and Yui has been sent to them as a "sacrificial bride". Key Plot Revelations

: A mysterious vision of a woman appears to Yui, causing a sharp pain in her chest—a recurring mystery that ties her fate to the Sakamaki clan. Production and Style Episode 1/Plot - Diabolik Lovers Wiki

When Yui Komori arrives at the secluded Sakamaki estate, she expects a new home arranged by her father. Instead, she finds herself trapped in a gothic nightmare that redefines the "reverse harem" genre with a sadistic, supernatural twist.

The episode opens with Yui arriving at a mysterious, rain-slicked mansion. Inside, she encounters Ayato, the first of six Sakamaki brothers, lounging motionless on a sofa. Assuming he is dead, she attempts to help, only for him to pin her down in a sudden show of predatory aggression.

: Yui quickly learns that her traditional religious protections and attempts to flee are useless within the mansion's labyrinthine halls.