Let's! Haikyū!? (Japanese: れっつ! ハイキュー!?,Ret tsu ! Haikyū !?)is a gag spin-off manga of Haikyū!!published in March 4, 2015 by Shueisha Inc. . The story is written by an author with the nick-name of Retsu, and the illustrations are done by Haruichi Furudate .
The spin-off series is drawn in Yonkoma-style and centers mainly around the original protagonist of Haikyū!!, Shōyō Hinata and team Karasuno . There is no main story or plot as the manga only rewrites the original story with jokes and silly situations.