Harukanaru Toki no Naka de: Banjyou Yuugi

Shirin has trapped the soul of the White Dragon Priestess within a dream that has no natural end. Inside it, the Priestess encounters three figures each claiming to be a fragment of her divided consciousness — and all four versions of herself are now locked in a replica of the capital, trying to determine which among them is the impostor preventing the real Priestess from waking. To earn the trust of Fujihime, who holds the key to getting out, they must retrieve four legendary treasures: the Robe of the Fire-rat, the Jeweled Branch of Hourai, the Dragon's Throat Gem, and the Stone Bowl of Buddha.