明るい性格で客にもスタッフにも人気があるリーダー的存在のしおりは、根暗で見た目も地味なメガネ女子ひかりのおどおどした姿を可愛らしく思い日頃からちょっかいをかけていたが…地味子の正体は女体に飢えた肉食絶倫モンスターだった！我慢できなくなった日陰女の本性がしおりの美しいスレンダーBODYに襲いかかる！獰猛にうねり絡みつく卑猥舌に立場逆転で後悔するほどイカされ続け、暴走した無限性欲に呑み込まれていく…

Shiori, a cheerful and popular leader among both customers and staff, finds the timid and unassuming Hikari, a gloomy girl with glasses, endearing and often teases her… but the plain girl's true nature is that of a lustful, insatiable monster! Unable to contain herself any longer, the reclusive woman's true nature attacks Shiori's beautiful, slender body! Her ferocious, writhing, and lewd tongue twists and wraps around Shiori, turning the tables and leaving her regretting the situation as she is continuously brought to orgasm and swallowed up by her runaway, boundless sexual desire…