With all of the parties lately, the Hinata Inn is in money troubles and everyone must chip in about $100.00 to help pay the outstanding bills.  All of the girls wind up getting odd jobs around Tokyo U campus.  Keitaro gets a job with the weird archeology professor that almost ran him down to give him is test pass earlier, Professor Seta.  Keitaro must also put up with his bratty "daughter" Sarah McDougal.  When Mitsune finds out about Seta, she knows that he's the one that Naru had a crush on in high school and does all she can to keep her from seeing him.