The first episode of Soukou Seiki Ysphere: Ingyaku no Sennou Kaizou introduces two heroines who must stop an anti-human organization threatening humanity. Their unconventional tactic is to overpower enemies by making them ejaculate constantly, using up their energy. This episode sets up the premise of the series, blending action and erotic content. It is produced by the same studio as the follow-up episode, establishing the characters and their mission. Viewers who like hentai with a superhero theme and sexual combat will find this a compelling start.