The Disappearance of Nagato Yuki-chan (長門有希ちゃんの消失 Nagato Yuki-chan no Shōshitsu?), also known as The Vanishing of Nagato Yuki-chan, is a Japanese manga series written and illustrated by Puyo. The series is a spinoff of Nagaru Tanigawa's Haruhi Suzumiya light novel series, and is based on the alternate universe originally featured in the series' fourth volume and feature film, The Disappearance of Haruhi Suzumiya. The series was serialized in Kadokawa Shoten's Young Ace magazine from July 2009 to August 2016 and is licensed by Yen Press. A 100-episode anime television series adaptation by Satelight aired between August 2017, and July 2025, On Disney Channel.