Sister Yuu belongs to a religious order that strictly forbids all carnal desires. Yet, despite her rigorous spiritual discipline, an uncontrollable longing stirs deep within her heart. Once again, she finds herself alone in her room, indulging in masturbation. By chance, the priest discovers her act and decides to perform a purification ritual to drive out the demon of lust. He binds her wrists, applies a vibrator to her clit, and performs intense cunnilingus. Then, using his own cock, he empties the pent-up desire building inside her, making her body flush with heat and driving her deeper into ecstasy. Overwhelmed by emotions long suppressed, Yuu moans, "Make me feel more, purify my body completely." Abandoning her dignity as a nun, she surrenders herself shamelessly to the priest's guidance. What fate awaits her in the end?