Marquis De... summary:

Masahiko Okada is an ordinary teacher perfectly content with his ordinary life – he just proposed to his girlfriend! But one night, three things happen: one, he notices that one of his students has been having it rough lately, two, he sees an adult magazine that looks eerily similar to that same student, and three, the student himself just saw him peeking…Miyama promises he won’t spread this incriminating pic on the internet, on one condition – Mr. Okada should spend the night with him. But will one night be enough?