Sadistic boy 3:when i wake up, i wish you were

Mamiya has Sarasa in his clutches. When Kazunari finds out what Mamiya has done, he sacrifices his dignity to save Sarasa and to expose the true Mamiya to the Principle. Meanwhile, Haruki sees the going love between Sarasa and Kazunari as something that will not include him. But while he makes a decision to leave them, Kazunari and Sarasa can?t stand to be without him. Will Mamiya realize that he is the odd one out, and will Haruki realize that he is very much wanted by both of his boys?