Nagi Watari: Oyobi Sono Hoka no Tanpen

Overview

A man and a woman come to a hot spring inn deep in the mountains. The woman is curious about the man living in the next room... A masterpiece collection of short stories by a rising star who has attracted attention from all over the world, depicting the limits of a woman and a man who can't go anywhere, in a poignant and erotic way. (Source: Kawade Shobo Shinsha, translated)

Source: AniList