Soul Eater Not! (ソウルイーターノット!) is a spin-off the main series, focusing on a freshman halberd named Tsugumi Harudori, who befriends two other Meisters, Meme Tatane and Anya Hepburn. The three take part in the NOT (Normally Overcome Target) class at DWMA and learn to control their powers in order to overcome their difficulties to have a normal life.
According to Ohkubo Atushi, Soul Eater Not! takes place during the Chapter Prologue's time frame (the first four episodes of the Soul Eater anime) but before the the actual story, which happens one year later.
See Main Article: Soul Eater Not! Manga
Soul Eater Not! (ソウルイーターノット! Sōru Ītā Notto!?) is a Japanese manga written and illustrated by Atsushi Ōkubo as a spin-off of Soul Eater. It began serialization in Monthly Shōnen Gangan on January 12, 2011. It is currently ongoing.
See Main Article: Soul Eater Not! Anime