It's been one year after Makabe Masamune and Adagaki Aki got together, and they're temporarily on a long-distance relationship when Aki moved to Sapporo to attend university. Koiwai Yoshino, who continued living at Aki's house, finally got accepted into Juntama University after failing their entrance exam last year, and she reunited with Makabe, now a second year student here. However, trouble immediately started when they got dragged into a game by the new freshman Kyougoku Iroha, and she claimed Makabe, who inadvertently “won” the game, as her “lover” against his will… **Note:** This title has its own page on Ichijin+, and chapter counts are following Ichijin+'s order and numbering, not the volume release's.

Even though Makabe Masamune's lost a lot of weight, change his family name, and stood on the top of the caste as a super hunk, somehow happenings with “ReOOO” occur every morning he comes to school, confusing Aki and his other friends…

It's Yasaka Private High School's 42nd Cultural Festival, and everyone's having fun with all the events and activities around the school. Aki's class 3-A comes up with an unique "Rental Boyfriend" service that caught eyes of many customers, boys and girls alike, and the rental boyfriend just happens to be Makabe Masamune, who's forced to play along to atone for a great crime he's committed…