Kuroneko (real name: Ruri Gokou) enrolls in Kyousuke's school, and Saori feels downhearted that she hasn't heard from Kirino. Kyousuke notices that Ruri is having trouble making friends due to her personality, so he decides they should try a membership at their school's Games Research club where the boy meets two other persons he never expected to be there as well.

With Sena and Kuroneko constantly quarreling in the Games Development club, the club president decides they'll have to write a game together and submit it to an online contest. Both girls have different concepts about the game's theme, so they'll both present them to the club whose members will then decide by majority vote whose concept will have to be implemented. And Kyousuke, with no programming skills thus acting as supervisor for the team, suggests to write an eroge—in order to have less competition and a better chance to win the contest.

As Ruri and Sena's game is bashed on the Internet they decide to work harder towards making a better game. As Kyousuke prepares to go home he receives a text message from Kirino telling him to throw away her collection of eroge and anime goods! Kyousuke contacts Ayase who confirms Kirino hasn't been in contact with her since she left either. Kyousuke then meets up with Ruri who encourages him to fly to America to find the root of Kirino's problem—and before the boy leaves she puts a special jinx on him.