Koro-sensei reminisces about his first meeting with Karasuma, where they first butted heads and fought against each other, ultimately coming to respect one another. However, Karasuma eventually points out their actual meeting wasn't nearly as eventful.

A 5000-year-old vegan dragon was living peacefully when one day a young girl showed up in his cave. She offered herself as a sacrifice in order to gain favor for her village. He played along as the great "Evil Dragon, the Demon Lord's Army Leader" in order to get rid of her. However, his little white lie awoke her hidden powers and his peaceful life suddenly ended.

Although already a third-year high school student, Rikka Takanashi remains a chuunibyou—a "disease" that causes people to fantasize about themselves and their surroundings. Her relationship with Yuuta Togashi has also gone unchanged for the past six months, and with entrance exams right around the corner, both of them strive to enroll at the same college. However, Tooka—Rikka's elder sister—decides to take Rikka to Italy as she has found a stable job there. This unforeseen turn of events causes a commotion between the couple as neither of them want to be separated from each other. Desperate for ideas, they seek assistance from their friends, and after a brief conversation, they come up with a plan—to elope. Chuunibyou demo Koi ga Shitai! Movie: Take On Me is a sensational drama featuring the couple—Yuuta and Rikka—as they journey across Japan. The two attempt to prevent Rikka from being taken to Italy, but will they be able to succeed in doing so?

When her newly-built home is razed to the ground by an earthquake, low-achieving, clumsy, and troublesome third-year high school student Kotoko Aihara is forced to share a roof with the school's—and possibly Japan's—smartest student, Naoki Irie. Kotoko is not actually a complete stranger to Irie-kun; unfortunately, a single love letter that she tried to give him in the past has already sealed her fate as far as he is concerned. Throw in some quirky friends and a meddlesome mother, and Kotoko might not even have a snowball's chance in hell of winning the older Irie boy's heart. Yet Kotoko remains optimistic that, because she now lives in his house, her unattainable crush on the genius since the beginning of high school has never been more within reach. [Written by MAL Rewrite]