Guest and Filia live in a small, secluded settlement. This village has a strange custom: they regard sneezing and nasal discharge as sacred. Although modernization has progressed and formal rituals are no longer performed, these values have never faded. As a result, there remains a significant gap between their culture and general modern hygiene ethics or manners. Having grown up in such a place, the two often play a game where they take turns tickling each other's noses to make the other sneeze. The roles of attacker (the tickler) and defender (the one being tickled) switch at fixed intervals. The attacker can use anything to tickle, such as paper spills or pepper. The defender must try to endure the tickling without sneezing. This game isn't just about winning by making the other person sneeze first; it's also important to make the other person produce what you consider a "good sneeze."