Fushigi no Kuni no Succubus | Episode 1
Based on the erotic doujin game by Muni Koubou (むに工房).
A boy falls down a well and ends up in a whole new world -- and before him sprawled a huge castle full of busty succubi! By borrowing the power of Louise, a girl that suddenly appeared in his hour of need, he hopes to find a way back home... however...
(Source: DLsite English)
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