A grown man on his face begging for fanservice is the entire joke, and the show never apologizes for it. The comedy lives in the pure absurdity of dogeza as a negotiation tactic that somehow, inexplicably, works on every girl he meets. If you're here for wit, leave; if you're here to watch someone debase himself with zero shame and get rewarded for it, this special knows exactly what you came for.
Dogesuaru returns in this one-episode special, listed as episode 13 of Dogeza de Tanondemita, and the Isekai-hen subtitle moves his antics into another world. He still wants a look at the girls' naughty bits, and his last-ditch method has not changed: he drops into a full kowtow and keeps groveling until his lewd request is heard. The heroines are caught off guard, flustered and confused by his sudden bowing. The result is a comedy with ecchi humor and a fantasy backdrop, built around his shameless persistence.