
An extra chapter of the Korotan D light novel. During a phone call about a dream, Fuwa reveals her new job at Shueisha and pitches a study guide built from Korosensei's old English lessons. Nagisa names it Korotan, framing the collection as their teacher's vocabulary book and giving the title its in-story origin.
Nagisa and Fuwa talk over the phone after he describes a dream to her. Taken with what he tells her, Fuwa suggests turning it into a book. She then shares that she has taken a job at Shueisha and pitches a further idea: a study guide drawn from the English lessons Korosensei once gave them, with Hazama handling the prose sections and Nagisa checking the English content. Before he can respond, she asks him to come up with a title. Reasoning that something plain will serve, Nagisa explains it will be Korosensei's vocabulary book and settles on the name Korotan.
Fuwa reveals her new position at Shueisha and proposes a collaborative study book based on Korosensei's English teaching. Nagisa coins its title, Korotan, framing it as their old teacher's vocabulary book.

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In Nagisa's Dream, an extra chapter of the Korotan D light novel, Nagisa describes a dream to Fuwa over the phone, and the conversation leads to the idea for an English study book based on Korosensei's lessons.
Fuwa tells Nagisa she has taken a job at Shueisha, the publisher, and proposes turning his dream and Korosensei's old English lessons into a study guide.
Fuwa proposes that Hazama handle the prose sections of the study book while Nagisa checks the English content, drawing on the lessons Korosensei once taught the class.
Nagisa coins the title Korotan in Nagisa's Dream, reasoning that something plain would work best and naming it as Korosensei's vocabulary book.
This extra chapter provides the in-story origin for the Korotan title, tying the entire light novel collection back to the English lessons Korosensei once gave class 3-E.
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