Kimi no Ne Futatsu, Ochitekite
きみの音ふたつ、落ちてきて · きみ の ね ふたつ 、 おちてきて
est. Rough estimate based on volume count, reprints and magazine — not an official figure
Overview
Note: Includes one extra chapter.
Source: AniList
External databases: AniList
How to compare editions, collected volumes and ISBNs / Sources, updates and corrections