Azatokutte, Hentai - Toshishita Osananajimi to Kikan Gentei Ai

Mio is due to enter into a marriage of convenience for the sake of her family. While she is afforded romantic freedom during her University years, she can't seem to forget a certain someone: her first ever crush. With only one year left before the arranged marriage, said lover boy, Aran, shows up out of the blue.