Kyoushi no Junjou Seito no Yokubou

Math teacher Mamiya Nagisa is teased by his horny students at an all boys high school on a daily basis. Until one day, genius high school student Sakura Minato transfers from America. Minato jumps in to save Nagisa but is told, "I want to sleep with you." When he asks senior teacher Tsukioka for advice, he is attacked by him. What will become of Nagisa's purity?