The members of Senkō High School's literature club become shocked when Jurai Andou, a boy usually known for his 'chunibyo' delusions, suddenly develops superpowers of his own. Six months later, each of the club members have since developed their own superpowers, which they put to the test in their monthly check-up. When student council member Mirei Kudou comes to check on the club, she ends up misinterpreting Jurai's chunibyo behavior and inadvertently reveals that she herself has developed superpowers as well. Mirei challenges the club to a superpower battle, using her own ability to steal Jurai's "Dark and Dark" ability, only to find it to be nothing more than a useless lukewarm flame. With the other members knowing not to show off their powers before her, Sayumi easily beat Mirei in a physical match. Learning that Mirei learned of the club's powers from an anonymous text, the group become curious about just who sent it.

Mirei receives an elaborately-phrased letter from Jurai, intended to give her ability the name of "Grateful Robber", but misreads it as "Grateful Lover", misinterpreting the letter as a love letter and declaring herself to now be Jurai's girlfriend, leading the entire club, Jurai included, baffled. After having to deal with both Mirei's over-the-top affections and the jealous glares of the other girls, Jurai explains the situation to Mirei, who seems heartbroken from being turned down. As Tomoyo Kanzaki comes to cheer up Jurai during his moment of guilt, he explains he chose that particular name for Mirei's power so it would match the others and show that she was one of their friends. Afterwards, Jurai receives an e-mail from Mirei apologising for the misunderstanding and accepting the name he gave her power.

While asking Jurai for some feedback on her completed novel, Tomoyo becomes embarrassed when she hears about a certain silver-wigged girl who convinced Jurai to continue his chunibyo lifestyle. Later, after the girls make Jurai to promise never to use his awakened power ever again, Hatoko helps Tomoyo with her studies. The next day, Jurai makes a promise with Chifuyu to take her to the pool during summer break, with Chifuyu learning that she may have developed feelings for him, while another male classmate, Shizumu Sagami, approaches Sayumi with the prospect of getting together with Jurai. Meanwhile, Hatoko reveals to Tomoyo that she is in love with Jurai, asking if she also feels the same.