Sayuka Kouenji is the Escalayer, the guardian of Earth against the dark forces of the Dielast. By her side stands the android Madoka, whose duty is to track and recharge the source of Sayuka's power, the Doki Doki Dynamo. Housed within Sayuka's body, the Doki Doki Dynamo can only be recharged when Sayuka experiences a high level of sexual arousal, which, until recently, Madoka has been able to provide. Facing unacceptably low energy levels, Madoka enlists the assistance of Kyohei Yanase, a boy from Sayuka's school. Kyohei once harbored a crush on Sayuka, and his sexual prowess could not have come at a better time. For now, arrayed against these three defenders of Earth is the Dielast version of the Escalayer, the FM77, who is ruthless in combat and brimming with violent desire.