Se-n-se-i 2

Shuichi Nakata is from one of the most powerful families in Japan. After the death of his father, he moved out to live with his childhood friend, an older girl named Kumiko. The two of them have lived under the same roof for so long that they're like brother and sister. As time passes she becomes a teacher, and Shuichi finds himself attending to the same school she teaches at. But when he learns that Kumiko is engaged to a teacher he hates, he crafts a devious plan to take her virginity before her new husband can, which catches more than one teacher in his sexual trap.