Her Melancholy

 is the fifth episode of The Disappearance of Nagato Yuki-chan.

Plot
Picking up immediately following the end of the previous episode, "Be My Valentine", Yuki flees from the clubroom when she sees Kyon accept chocolate from Haruhi. Ryoko and Koizumi see Yuki running away, and Ryoko accuses Haruhi of sabotaging her plan to confess love to Kyon. Haruhi says she has misunderstood, and gives Koizumi a chocolate bar identical to the one she gave to Kyon - implying that her gift to Kyon was an obligation chocolate, not a love chocolate. Kyon is deeply disappointed, but Ryoko is unconvinced. When she and Haruhi both go looking for Yuki, she accuses Haruhi of trying to steal Kyon from Yuki by giving her chocolate to him first. Haruhi insists that her accusations are irrational.

Haruhi and Ryoko find Yuki, who claims she was not at all upset by Haruhi giving chocolate to Kyon, and that she simply wanted to extend Haruhi the courtesy of letting her give him the chocolate in private. Yuki asks Haruhi if she is in love with Kyon, and Haruhi gives a noncommittal answer.

Yuki gives her chocolate to Kyon in the courtyard while Haruhi and Ryoko observe from an upper floor window. Kyon misinterprets the gift as another obligation chocolate, so Yuki then attempts to confess her love to him, but Tsuruya plows into her in an overenthusiastic congratulations on her giving him the chocolate. Haruhi recalls meeting Kyon when they were both children; she did not recognize him at first because he used the pseudonym "John Smith" on their first meeting.

On White Day, Kyon gives identical gifts to Yuki and Haruhi, frustrating Haruhi (because he copped out from choosing between the two of them) and infuriating Ryoko (because courtesy if nothing else would dictate that Yuki get a larger gift in return for her homemade love chocolate than Haruhi got for her store-bought obligation chocolate). However, seeing that Yuki is pleased with her gift, Ryoko lets it go.

Differences from manga version
The scene between Koizumi and Kyon does not appear in the manga. The anime in general pays more attention to Kyon's feelings towards Haruhi: he is smiling when he receives Haruhi's chocolate (in the manga he wears a completely neutral expression), his immediate reaction to Haruhi giving identical chocolate to Koizumi is shown, and the scene with him reflecting on the gift with Koizumi was added.

Haruhi's statement that it is having the courage to give Kyon Valentine's chocolate that counts, even if he thinks it is courtesy chocolate (spoken in the context of Nagato's gift, but in a tone of voice that indicates she is talking about her own gift) is also an addition of the anime that does not appear in the original story.

Characters

 * Yuki Nagato
 * Ryoko Asakura
 * Kyon
 * Haruhi Suzumiya
 * Itsuki Koizumi
 * Tsuruya
 * Mikuru Asahina