Niji Wa Yako Ni Kirameku summary:

Nakajima, who enjoys traveling alone got lost wandering on a legendary mountain of many rumors. He was helped by Kanzawa, who lives alone nearby. In the midst of his purposeless journey, Nakajima is fascinated by Kanzawa, who lives like a recluse. This is the story of Kanzawa who lives quietly on a secluded mountain and Nakajima who comes from a crowded city.