Otherworld "Lies" Guide

Otherworlds are super fun! Battles with monsters, adventures, and delicious food you've never tried before! But somehow, these rules feel weird... Is it really "normal" in an otherworld...? Nagare, a Japanese man suddenly transported to another world, was lost and confused until he was rescued by Nana, a girl from the Servant tribe. She taught him that every otherworld has its own unique customs and, thankfully, offered to act as his "guide." However, her true intention is a scheme to exploit Nagare's ignorance, creating false facts with lies to make him her companion...? Meanwhile, various other girls are approaching him, using every trick in the book to capture him...!? An otherworld "reverse-ignorance" situation comedy!