Saint Elna and the Book of Depravity ~The Sex Duties of the Busty Sister~

About

Elna, the busty sister of Ulunka Village. One day, she receives a request for assistance from another village and sets off for 'Adus Village," far from her hometown. There, she is tasked with watching over "Lenis the Incubus," said to have been sealed in the village's cave since ancient times. Upon visiting the cave, Elna discovers an old book deep within. As Elna approaches, the book suddenly emits a strange light, and the sealed incubus is inadvertently released.

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