Long, long ago, there was a kingdom, and a princess who was born with an incurable illness.
A kunoichi was designated as her guard, and they soon became lovers.
She even received the name "Sakura" from her.
However, one day, the princess collapses, and she appears to be at death's door.
Sakura sets out to find a certain panacea to cure the princess' illness.
However, it is sealed in a cave filled with monsters and ero traps...