Karen, a popular leader with a bright personality that both customers and staff adore, finds Mai's nerdy glasses girl look cute and often teases her... but little does she know that Mai's dull exterior hides a ravenous monster with insatiable lust for female flesh! When Mai's true nature finally gives in to her hunger, she transforms into a ferocious beast, attacking Karen's stunning slender body with unbridled passion! Overwhelmed by Mai's relentless tongue and unable to resist any longer, Karen succumbs to her primal desires as they engage in an endless sexual frenzy that leaves them both begging for more...

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かれんは、根暗で見た目も地味なメガネ女子まい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かれん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…。