There is a rumor about a DVD that curses anyone who watches it, setting the stage for episode 1 of Koakuma Kanojo The Animation. Though no one seems to believe in the curse few are brave enough to see what is on the DVD, until Akuno Mika watches it and gets transformed into a succubus, struggling to keep the change a secret before losing control around Kazuya. Later, Kana agrees to watch the DVD after two of her friends ask her, growing something regular women do not have, while her sister Mai tries to help. This animated episode features futanari, yuri, demon, blowjob, masturbation, and boobjob content.