I Can't Suddenly Change

I Can't Suddenly Change is the fifteenth episode of the Lucky Star anime.

Main Story
Konata, Kagami, Tsukasa, and Miyuki win tickets for a live concert event, Suzumiya Haruhi no Gekisō. There, Konata's view is blocked by a "big guy" but Kagami notices it and swaps places with her. After the concert, Konata starts to feel new feelings that she can't explain and are never elaborated on. When April Fool's Day comes around, Konata calls Kagami and tells her that she is done with her homework, and Kagami falls for it. Nanako later calls her and tells Konata she accidentally wrote over one of Konata's saved games, which makes Konata lie to Nanako about Miyuki, after falling for the April Fool's joke. Kagami asks Tsukasa if she ever fooled someone, and Tsukasa explains that she just did. When the new school year begins, Konata, Tsukasa, and Miyuki are put into the same class again, while Kagami is put into a separate class. Yutaka is in the same class as Minami, and is starting to become good friends with her.

Lucky Channel
Akira manages to scare Minoru by telling him that this was his final appearance before revealing that it was nothing more than an April Fool's joke. Akira then begins complaining as to how Minoru appeared as the MC at Suzumiya Haruhi no Gekisō in the actual episode, and how she has not had a concert of her own for a while, before discovering through Minoru that the producer has actually booked a concert for her next week. Akira is ecstatic at this news.

Trivia

 * The concert the characters are at in the beginning of the episode stars Aya Hirano. Aya Hirano is Konata's Japanese Seiyu.
 * During the concert, the "big guy blocking" Konata had a T-shirt with the SOS Brigade's symbol from The Melancholy of Haruhi Suzumiya on his back.
 * The preview for the following week's episode is done by the minor members of the Hiiragi family: Inori, Matsuri, Miki, and Tadao.