The humor and tension come from the between what the mob thinks is happening (normal day) and what the reader knows (epic saga collapsing).
Did this article help you find the exact manga you were looking for? If not, please refine the keyword—especially the senshina portion, which may be a typo for 戦士 (warrior) or 潜在 (potential). Leave a comment below with more context! The humor and tension come from the between