第 13 集: 長門有希-chan III 探討有希在與古泉和涼宮參加書展約會後對消失的恐懼
2015年6月27日 播出
Following their exams, Nagato asks Kyon and Ryoko to take her to a used book fair. On the way back, Ryoko leads Yuki to realise that she has fallen in love with Kyon, leaving her even more fearful about her inevitable disappearance. Sensing the next time she falls asleep will be her last, Yuki spends the day with Ryoko, keeping her disappearance a secret from her. Later that night, Yuki confesses to Kyon over the phone, falling asleep by the time Kyon reaches her, after which the original Yuki wakes up in her place. (Source: FUNimation)