Ko Kuu Monogatari
こくう物語 · こくう ものがたり
est. Rough estimate based on volume count, reprints and magazine — not an official figure
Overview
A strange character, half philosopher, half charlatan, arrives at a small mountain inn run by a lonely woman who also looks after her younger sister Karen and her younger brother Heikichi. He leads them into a wonderful world, searching for fox eggs among the pebbles in the river and talking with angels. (Source: Éditions Picquier, translated)
Source: AniList
External databases: MADB · AniList
How to compare editions, collected volumes and ISBNs / Sources, updates and corrections