Rei Hino is a young woman who possesses exceptionally strong spiritual powers. Usagi is intrigued by the young priestess' beauty and goes to meet her. Luna suspects that Rei may be the long-lost princess or even another of the Sailor Senshi.
When a young girl goes missing after visiting Rei, Usagi believes that it is connected to a rumour about a demon bus. When Jadeite captures Rei and takes her inside the Demon Bus, Usagi and Ami enter the portal, but soon realise it is a trap.
Rei is revealed to be Sailor Mars, when she transforms she uses her flame attack to overpower Jadeite's ice abilities. After Jadeite retreats the missing children are safely returned to their families.