Eunha, a college student, is asked by Hodeok—someone she’s long had a crush on—to help with his graduation thesis. She struggles to turn him down, but he reveals he’s an alien and pressures her into agreeing. The alien’s thesis topic is none other than “the sexual pleasure of Earthlings.” As the research—using tentacles and other methods—progresses, the initially flustered Eunha gradually begins to feel sexual pleasure, and seeing her aroused, Hodeok develops feelings for a human for the first time… Will Hodeok be able to complete his thesis without a hitch?