Boku to Kotori-chan
ぼくとことりちゃん · ぼく と ことりちゃん
est. Rough estimate based on volume count, reprints and magazine — not an official figure
Overview
Kotori-chan and Hi-chan promised to marry each other when they grow up. But 10 years forward, the only one who’s actually “grown” is Kotori-chan, while Hi-chan still looks like a grade schooler. Hilarity ensues. (Source; MU)
Source: AniList
External databases: MADB · AniList
How to compare editions, collected volumes and ISBNs / Sources, updates and corrections