Rentarou's Family's Families' Daily Lives
愛太郎ファミリーのファミリーの日常, Rentarou Family no Family no Nichijou
A "The 100 Girlfriends Who Really, Really, Really, Really, Really Love You" spinoff that tells stories about the characters' families, drawn by the author himself.
Main series: The 100 Girlfriends Who Really, Really, Really, Really, Really Love You