When Mizuki Hijiri transferred to a new school, all she wanted was to live a normal school life, but that did not prove to be the case when she met the infamous Hero Club. All of its members are boys suffering from various types of chuunibyou—Yamato Noda is a righteous hero, using his athletic abilities to perform noble deeds and protect others; Kazuhiro Nakamura claims to be the reincarnation of "Touga Ryushouin," the result of the forbidden union between a demon and an angel; Tomoki Takashima is a pretty-boy otaku whose one true love is the 2D anime girl Sora; and Rei Tsukumo plays the role of a schemer, covertly pulling the strings. Dragged along as the newest member of the Hero Club, tepid Hijiri can't obtain the normalcy that she desires. But even so, despite their various quirks, their bonds of friendship are real; Hijiri's life can only get more exciting when she joins in on their delusions of grandeur!

Momoko is a beautiful young sword fighter who was born inside a peach (momo in Japanese). She lives with her constant companions—the dog god Inugami, the monkey god Sarugami, and the pheasant god Kijigami—in a peaceful paradise. However, a demon army led by devil king invades the paradise and steals the precious treasure that protects Momoko's land. To retrieve the treasure and save the people, Momoko embarks on a great adventure with her three companions.

Chinami and her friends have formed an organization called OZ, with the financial backing of the Kujo Group. Their goal is to peacefully integrate people with Type-E abilities into society, and oppose the Foundation, an organization which seeks to capture and control Type-E users for their own mysterious purposes.

Mana Shikimiya has just transferred into Marehoshi Academy, a school which requires each of its students to join one of the many sports or cultural clubs. After a quick tour of most of the clubs by the Student Council Vice President Minori Hasegawa, Mana stumbles upon the Lyrical Tradition Dance Club. There she meets its sole members: Mizuha Ichikishima and Sayu Tsukisaka. Drawn to their singing and dancing, Mana joins the club and together they work towards their dream of winning the Prism Stage—a national competition to determine the top idols of the country. However, before Mana and her new friends can worry about the Prism Stage, there is a more immediate problem at hand: the club is about to be disbanded by the student council! Without enough members or any notable achievements, the club will be shut down and the members' dreams will be over before they've begun to pursue them. It's up to the three of them to find the additional club members they need and become an idol group strong enough to qualify for the Prism Stage and to win it as well.