After falling in battle against Chara and losing everyone in the Underground, Sans awakens in Mewni, a strange world ruled by ancient magic and wild creatures. For three weeks he survives alone in a cave as a hermit until witnessing an important event: the birth of the kingdom of Mewni, where Glossarick grants the first magic wand to the settlers, beginning the history of the kingdom

A normal guy got isekai'ed into GX verse, and how he proceed with the madness ongoing in this world... Disclaimer: All rights belong to Kazuki Takahashi, I own nothing in this fic beside my OC.