In the depths of an otherworldly island, Nanase, a young woman torn between her desires and her duties, finds herself drawn to her mysterious benefactor, Touka Reizeiin. Caught in a whirlwind of taboo longing, she struggles with her feelings, yet her body betrays her, yearning for his touch. As she succumbs to her lust, she wonders if she's making the right choice, but the forbidden fruit tastes too sweet to resist.