Some time has passed since Yuna wandered into the succubus world. There, the succubus suggested that they seduce a man who hated succubi as a test of their abilities. Yuna and the succubus went to see the man, Balkan, but he was as stubborn as the rumors said, and he cried out about the sorrow he had suffered in the past and his hatred for succubi! "A real succubus is! A being that gives pleasure to humans!" The enraged succubus borrowed Yuna's body and attacked Balkan! Can Balkan withstand the succubus's incredible techniques!? What will become of Yuna's test of abilities!? To meet the Queen of Succubuses, they must venture deeper into the demon castle, protected by a barrier... To return to her own world, to break the barrier, Yuna, the tomboy who adores her big brother, continues her naughty succubus training!