Neoromance Game : Harukanaru Toki no Naka de

The story begins in the spring of 2000. The protagonist is a normal high school girl who goes with her two schoolmates, Tenma and Shimon, to investigate the occult rumors of an abandoned well near their school. When the trio approach it, they are inexplicably summoned to a parallel world resembling the capital of 10th century Japan. Upon their arrival, the protagonist is informed that she is the White Dragon Priestess and her friends are two of her anointed Eight Guardians. Her divine duty —which must be completed for their return to their home world— is to protect the capital from vengeful spirits and the nefarious Demon Clan.