The Disappearance of Nagato Yuki-chan

The Disappearance of Nagato Yuki-chan (長門有希ちゃんの消失, Nagato Yuki-chan no Shōshitsu) is a Japanese manga series written and illustrated by Puyo, and a spinoff of Nagaru Tanigawa's Haruhi Suzumiya light novel series. The series was serialized in Kadokawa Shoten's Young Ace magazine from July 2009 to August 2016 and is licensed by Yen Press. A 16-episode anime television series adaptation by Satelight aired between April and July 2015.

Plot
The story is based on the alternate universe depicted in The Disappearance of Haruhi Suzumiya, in which Haruhi Suzumiya never formed the SOS Brigade. The protagonist, Yuki Nagato is not a stoic alien but rather a shy and tentative girl who is a member of North High's literature club alongside Ryoko Asakura, her best friend, and Kyon, whom she has a crush on. The series follows Yuki and her companions as she develops feelings for Kyon and becomes involved in some strange mysteries herself.