Kansen: In'yoku no Rensa (2009)

Yasuyuki is a high school student in love with his classmate, Yuu. He decides to join her film club to be near her. The teacher, Shindou Risa, and club members plan an overnight training camp on school grounds during summer vacation; Yasuyuki jumps on the opportunity. However, they are unaware that a virus is within the school, making those infected experience intense lust.