Fushigi Yuugi OVA

Synopsis

The woman who rescued Tamahome introduces herself as Kaen. She tells him that when Tamahome defeated Nakago, Nakago didn't die but went into a deep sleep. When he revived, Nakago took over Tamahome's body, and Tamahome's soul went into Nakago's body. Confused, Tamahome he can't believe he is really Nakago. Kaen offers him a bowl of sake to help calm him, which he drinks. After he falls asleep, Kaen undresses and offer to use Soi's celestial ability to raise his chi through sex. Later, Tamahome fights with Kouji, the leader of the Tasuki's former band of bandits, who also sees Tamahome as Nakago. During the battle, Tamahome unleashes Nakago's blue chi attack killing many of the bandits and fatally wounding Kouji. Kouji tells Tamahome that only a year has passed since the summoning, then pulls out a bomb saying he will bring Tamahome back. As the blast envelops them, Kaen changes into Tomo and reveals the sake was full of kodoku, the drug that once caused Tamahome to almost kill Miaka. Nakago says anything he sees since he arrived in Konan was an illusion made by Tomo, but the kodoku in the sake was real. In the real world, the group have confirmed that all of the priestesses will disappear and that Takiko's existence is slowly being erased. Yui goes into a trance and is pulled into the book. Meanwhile, Chichiri, who felt Tamahome's chi, and Tasuki meet with Suboshi, who is using his brother Amiboshi's body. Tomo arrives with Yui, who is now the Priestess of Genbu, and two children who are her first Genbu warriors. Nakago/Tamahome also appears. Realizing Yui was the one who stole the book, Miaka goes in after her.

(Source: Wikipedia)