Act I: Sailor Spring

For many centuries the world has been safe from Lord Hades, ruler of the Shadow Empire. But after the fall of the Dark Kingdom, Hades finally gets a break in finding the lost gate from Tartaros to Earth. This new help comes from none other than... Jadeite!

To counter the threat from Hades, Shinnen Nakano is called by a mysterious light at Kyokukou shrine. He is Captain Sylvester and his mission is to find the four season soldiers, for they are the guardians of Earth.

Shinnen finds out Haruko Higashino is Sailor Spring. Her powers are soon tested when Jadeite uses one of Hades' Black Heart crystals to turn her classmate Asami into a demon who uses her breath-stealing myst to wreak havoc on the school!