Invaders of the Rokujouma!? Volume 31 by Takehaya

In this collection of side stories: Clan and Yurika try their hardest in a triathlon in order to earn a special reward from a special someone, Harumi and Maki embark on an unusual journey of self-improvement on an impromptu day off, and... Shizuka and Ruth finally have their fated showdown?! Then, in a very special Harumi feature, we get a glimpse into what life would be like between Harumi and Koutarou if they started dating.