Following the events in Amagami SS, Junichi Tachibana, a high school student, navigates his relationships with various girls from his school in Amagami SS+ Plus. This sequel delves into the aftermath of each girl's story resolution, showcasing new developments between Junichi and the girls. From Tsukasa Ayatsuji's student council campaign to Rihoko Sakurai's lingering confession desires, the series explores the evolving dynamics. Ai Nanasaki grapples with uncertainties about her future with Junichi post-college departure, while Kaoru Tanamachi contemplates the depth of their relationship. Sae Nakata faces classmates' disbelief about her relationship with Junichi, and Haruka Morishima aims to take their bond to the next level by considering marriage.