The series arc of 'Stratosphera no Yousei' centers on Ciel, the divine Goddess of the Stratosphere, who must engage in intensely lewd sexual rituals with her two shrine maidens, Lapis and Ruri, to maintain the world's balance. The series begins with the priestesses performing sacred cunnilingus on the goddess, their tongues expertly worshiping her divine clit and lapping up her holy nectar until she achieves a world-sustaining orgasm. As the series progresses, the power dynamic shifts and Ciel descends from her throne to reciprocate the pleasure. She ravenously eats out both Lapis and Ruri simultaneously, burying her face in their groins and driving them into screaming ecstasy. The grand arc culminates in passionate, unrestrained yuri threesomes where all three beauties engage in wet, sloppy scissoring and tribadism, their bodies grinding together as they fuck each other senseless in a torrent of divine fluids and shared orgasms.