Haruka, a third-year student in the Faculty of Science and Engineering, is so enthusiastic about her research that she failed her course and is in danger of not being able to go on to graduate school. When her professor offers her a sweet story...she reluctantly accepts it, but when he inserts his dick into her, she reacts sensitively and twitches, which surprises even herself. When the professor arranges for her to be gang-raped, her masochistic side blooms and she transforms into a slutty woman who devours dick herself!