Banished from the Hero's Party, I Decided to Live a Quiet Life in the Countryside, Vol. 5 (light novel) - Yasumo Zappon

A ring’s the thing​Red is prepared to take the next step with Rit and wants to propose. Determined to find the perfect stone for the engagement ring, he plans a trip to a mountain range known as the Wall at the End of the World. Meanwhile, a former member of the Hero’s party, Yarandrala, shows up in Zoltan looking for Rit. Although she causes a bit of trouble after a misunderstanding, her presence may be fortuitous as all is not well up on the peaks. What started as a simple excursion for a ring quickly becomes a struggle for survival with all life on the mountains hanging in the balance.