A prototype one-shot released in the April edition of JumpSQ in 2017. Later on serialized in Jump plus under the name of *Suginami Toubatsu Koumuin: Isekai Kinmu no Hitobito*.

Senyuu comics that Haruhara Robinson uploads to his blog, which range from short omake comics to longer stories. Table of Contents Ch. 1-14: One to three page short comics, mainly drafts and/or storyboards except Ch. 10 - Parfait, which is fully inked and coloured. Ch. 15-34: SQ Senyuu! - a set of short comics set in the Senyuu SQ universe. Most are fully inked, but some are in rough draft form. Ch. 35-41: Everyone's Safe - a set of AU comics featuring Ross, Crea, and Lake, where nothing bad ever happened in Originia. Ch. 42-43: A Day Not Too Long After The End of Season 2 - What Ross and Crea got up to at the start of their journey after Season 2. Fully inked. (Source: MangaDex)

Yuuka x Alice? Not the first pairing that would come to mind, but here’s an anthology with seven interesting stories around the concept.

The four great majin who threatened the world were sealed away by the hero. For a thousand years! But they did not give up... for these four great majin with colourful personalities, one thousand years of play and amusement is about to begin! Original Web Manga