Touching The Night Stars
星の夜に触れて · ほし の よる に ふれて
est. Rough estimate based on volume count, reprints and magazine — not an official figure
Overview
This volume is a companion piece to Hoshi no Yakata. The third chapter is a prequel to the series, showing Sakurai's past before he became the master of Hoshi no Yakata as well as how the mansion came into his possession. The remaining chapters feature short side stories that are more loosely connected to the main storyline of Hoshi no Yakata.
Source: AniList
External databases: MADB · AniList
How to compare editions, collected volumes and ISBNs / Sources, updates and corrections