Mama Yuuyuu: Kaki Oroshi Kanketsu-hen

Demon King x Hero x Multiverse! When Demon Kings and Heros from other worlds start arriving the world is plunged into chao! The battle fantasy that caused a huge sensation when it was serialized in Weekly Shonen Jump is now complete!
(Source: Shonen Jump Plus, translated)
Note: Three epilogue chapters for the series "MamaYuyu" which were posted to Shonen Jump Plus a day before they were published in the final volume release.