Chika Takami, a self-proclaimed normal girl, has never been involved in any clubs and lacked any notable talents. However, after a visit to Tokyo, she discovers a stage where even an ordinary girl like her could shine—the world of school idols. Inspired by the former superstar school idol group μ's, Chika is determined to start her own school idol club in her seaside hometown at Uranohoshi Girl's High School. But even before gathering any students to join the group, the aspiring school idol finds her greatest obstacle to be student council president Dia Kurosawa who stands firmly against the creation of the club. Just when it seems there is no hope, Chika meets Riko Sakurauchi, a transfer student from Otonokizaka High School, home of μ's. Somewhat shy but a talented piano player, Chika believes her to be a promising recruit, though convincing her to join is easier said than done. In spite of that, Chika chooses to charge forward and overcome the obstacles keeping her from forming a school idol group that shines as bright as the nine that came before her.

Tomoya Okazaki is a cynical delinquent who lacks ambition as he apathetically labors through high school. During his childhood, a tragedy had caused his father to seek solace in alcoholism and neglect his son. Yet, meaningful human interaction can be a benediction, as Tomoya learns when he meets the enigmatic Nagisa Furukawa. The odd girl offers a gesture of friendship to Tomoya, but he rejects the request, dismissing it as a trivial incident. However, as he soon realizes that he is encountering Nagisa more and more often during school, Tomoya drops his discompassions and befriends the girl. When he learns that Nagisa's dream is to revive the Drama Club, Tomoya decides to shed his detachment from the ordinary pleasures of life and dedicate himself to helping his new friend achieve her ambition. But what starts as a simple friendship may progress into something far more deep, intimate, and life-changing. As the pair face various hardships and afflictions, Tomoya and Nagisa gradually come to terms with the challenges of life.

In the aftermath of Amagami SS, high school student Junichi Tachibana continues his relationships with the girls at his school. Amagami SS+ Plus offers a glimpse into what happened after the resolution of each girl's individual story. New events begin to take place between each of the girls and Junichi. Tsukasa Ayatsuji, the class representative, runs for student council president; Rihoko Sakurai, who has taken over the Tea Club with Junichi, still wants 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 go any further; Sae Nakata and Junichi deal with classmates who still can't believe that someone so cute is his girlfriend; and Haruka Morishima wants to take their relationship to the next level and get married.

For some people, high school represents the opportunity for a fresh start. You can take new classes and make new friends. For Souichiro Nagi and Bob Makihara, though, high school means something different: the chance to become the top fighters in the entire student body! Too bad Toudou Academy is the hardest possible place to realize their dreams. Their new high school is no ordinary academic institution. Rather than concentrating on classic subjects like math and science, Toudou Academy was created for the sole purpose of reviving the martial arts in Japan! As a result, Souichiro's aspirations to become top dog are cut short when he runs afoul of Masataka Takayanagi and Maya Natsume. The two upperclassmen easily stop the freshmen duo's rampage across school, but rather than serving as a deterrent, it only stokes their competitive fire. What kind of monstrous fighters attend Toudou Academy? Are there any stronger than Masataka and Maya? And why in the world is Maya's younger sister stalking Souichiro? Learn the answers to these questions and more in Tenjou Tenge!