After the events of Amagami SS, Junichi Tachibana's journey of romance with the girls from his school continues in Amagami SS+ Plus. The anime offers a glimpse into their lives post-resolutions. The girls embark on new experiences with Junichi. Tsukasa Ayatsuji, the class representative, enters a student council presidential campaign. Rihoko Sakurai, who is the current head of the Tea Club with Junichi, still longs to confess her love for him. Ai Nanasaki contemplates her future with Junichi as he leaves for college. Kaoru Tanamachi questions the progress of their relationship. Sae Nakata and Junichi tackle their classmates' disbelief that she is his girlfriend. Meanwhile, Haruka Morishima considers taking their bond to new heights by considering marriage.