遊んでばかりのギャル・さりなは、優秀な大学院生。さりなより評価が低い大学院生・野口は、さりなへの嫉妬からチンポ生え薬を作り、さりなに飲ませる。翌朝チンポが生えてきて慌てるさりな。チンポ脳になり体が疼いてきて…

Sarina, a carefree girl, is a brilliant graduate student. Noguchi, a graduate student with lower academic standing than Sarina, is jealous and creates a penis-growing potion, which he gives to Sarina. The next morning, Sarina is shocked to find she has grown a penis. She becomes obsessed with penises and her body begins to ache…