Board Thread:Manga/@comment-27441457-20171108210024/@comment-27441457-20171112032110

We'd need confirmation from Isayama in an interview or something similar to consider Lost Girls a spinoff on the same canon level as No Regrets. Isayama's writings have shown similarities to spinoff content before without confirming canonicity itself, such as entries related to iron bamboo and iceburst stones in the Attack on Titan Guidebook.