Busty Sister Erna from Urunka Village. One day, she receives a request for cooperation from another village and goes to “Adus Village” far away from her hometown. There she is given a mission to keep an eye on “Demon Renis”, who is said to have been sealed in a cave in the village since ancient times. When Erna approaches, the book suddenly emits a dubious light and the sealed succubus is released.
Even though she resists the enormous magical power, When Erna is about to get into her, Succubus hijack her consciousness. With the help of her colleague Sister Aira, she escapes danger, but the succubus is still inside her body…
and to counteract her overflowing libido, she takes a “special aphrodisiac that suppresses the succubus.” It is said that you have to endure “7 days” while enduring the libido that
occurs as a side effect. There’s no way the perverted men in the village who are starving for her will leave this  blushing sister alone…

Erna’s seven days of lust begin…