Kyoukasho ni Nai!  

Not in the Textbook!, Very Private Lesson, Совершенно частный урок!, 教科書にないッ!

It seems like Oraku has quite a bit going on in his life. He's got a comfortable job as a high school teacher and a beautiful student named Aya who loves him. However, there are some challenges that he must overcome. Firstly, Ayas father is a wealthy crime boss who wants to ensure that she stays pure, which means that Oraku must be careful not to give in to his desires for her. Secondly, there are many people at school who would love to get their hands on Aya, so Oraku will need to protect her from them. Lastly, if any of the other teachers find out about him living with one of his students, he could be permanently dismissed from his job as a teacher. Despite these challenges, it's clear that Oraku is lucky to have such a supportive network around him and to be in love with someone like Aya.