The MarduKard tournament is over, and the results are in: MardukCorp's mind control schemes are worse than anyone had thought. Now Jun, Riko, and friends are renewing their efforts to uncover the mechanism that is controlling the local population so they can free their families and friends. However, investigating the MarduKard hardware leads them to discover even more frightening developments lurking around the corner… because there's a demon on the company's staff?! Ayumi Kurohane seems to have a complicated relationship with Riko and Tomoe, but that doesn't stop her from offering them all a chance for an internship with Maruimachi's largest employer. Will Jun and friends find MardukCorp's secrets, or will they succumb to its addictive benefits package?