Following the events of Amagami SS, high school student Junichi Tachibana continues his relationships with the girls at his school. Amagami SS+ Plus provides a look at what occurred after the resolution of each girl's individual story. New events unfold between Junichi and each of the girls. Tsukasa Ayatsuji, the class representative, runs for student council president; Rihoko Sakurai, who has taken over the Tea Club with Junichi, still wishes to confess her feelings to him; Ai Nanasaki questions the future of her relationship with Junichi when he leaves for college; Kaoru Tanamachi wonders if her relationship with Junichi will ever progress further; Sae Nakata and Junichi deal with classmates who still cannot believe that someone so cute is his girlfriend; and Haruka Morishima wants to take their relationship to the next level and get married.