The announcement on Haganai volume 17 arrived stating that the next volume, vol. 18, would be the last one. The manga had started in Japan in 2010. Haganai: I Don’t Have Many Friends is often called Haganai for short or called boku wa tomodachi ga sukunai in Japan.
Haganai the manga is biased after a Light novel of the same name which had 11 installments and released in 2009. The Light Novel also had two Anime season biased off of it. If you wanted to pick up the Light Novel after the anime you should start on Volume 9. The Manga start to have new content in volume 15. The light novel did have three books that isn’t part of the numbered set. Boku wa Tomodachi ga Sukunai CONNECT takes place ten years before the events of the original series. It tells the story of Kodaka Hasegawa and Sena Kashiwazaki’s parents
Boku wa Tomodachi ga Sukunai Universe is extra content but isn’t given a place in the timeline, a lot like the two extra manga books.
The story focus on Kodaka Hasegawa, a new student to the school that after a month couldn’t make any friends. Meeting with fellow loner Yozora Mikazuki the two started up a club called ‘The Neighbor’s Club’. Created for people who don’t have friends, daily activities involve learning social skills and how to fit in, which will hopefully allow them to make friends. Joined quickly by the another lead character Sena Kashiwazaki, and other eccentric outcasts.