Spin off of The Melancholy Of Haruhi Suzumiya?

The Disappearance of Nagato Yuki-chan is a spin-off light novel series written by Nagaru Tanigawa and illustrated by Noizi Ito. It was serialized in Kadokawa Shoten's seinen manga magazine Monthly Shōnen Ace from May 2009 to May 2016. The series follows the adventures of Yuki Nagato, a first-year student at North High School who is the leader of the SOS Brigade, a club dedicated to investigating supernatural phenomena.

The Disappearance of Nagato Yuki-chan is set in an alternate reality where Yuki Nagato is the only member of the SOS Brigade. The other members of the club, including Haruhi Suzumiya, Mikuru Asahina, and Itsuki Koizumi, have all disappeared. Yuki is determined to find out what happened to her friends and bring them back.

The series is told from Yuki's perspective and explores her thoughts and feelings as she investigates the disappearances. It also delves into the relationships between the members of the SOS Brigade and how they have been affected by the disappearances.

The Disappearance of Nagato Yuki-chan has been praised for its character development and its exploration of the themes of friendship and loyalty. The series has also been praised for its beautiful illustrations and its faithful adaptation of the original light novels.

The Disappearance of Nagato Yuki-chan is a must-read for fans of The Melancholy of Haruhi Suzumiya and for anyone who enjoys a good mystery.