The volume is split in two stories, the first story is located in the tennis club where Rika participates (though she is not the center of the story) and the second one is located at the office where the Anna Kazushima from Ane to Otouto to works and is centered around her boss.
The first story locates in the school were Morisaki Sensei works, pretty much just like any other Fuuga work. The second story references Miwaku no Tobira, as the main female lead from there was the girl who was dumped by Hiroaki in favor of a relationship with his own younger sister