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The Professor (Not be to be confused with the other Professor is the central male character in the University Girls bonus OAV, My Honny is a College School Girl (Also called Okusama wa Joshikousei, which is also the name of a different anime/manga series with a similar theme).

The Professor is recently married to one of his students, Mika. However, before the marriage, both the Professor and Mika had secret affairs. Mika had hers with Yosuke, a fellow student, and the Professor had his with another unnamed professor. Neither side ever finds out. Despite these affairs, the two seem to be in love.