The Satomi band of knights is steadily expanding and all is well in room 106. At least for a little while. Yurika comes to everyone with an unusually serious request—she wants them to help her savior and mentor, the former Rainbow Nana. Children then mysteriously start going missing in Kisshouharukaze City, which can only mean one thing. The evil magical girls of Darkness Rainbow are back in town and they mean serious business this time. Deadly serious business.

 Yurika has made the bold decision to attack Darkness Rainbow’s base in order to try and prevent all-out war in Folsaria. It’s going to mean a bit of a field trip for everyone, and a very big battle. Koutarou and the girls will have to consolidate all of the power they have—and maybe borrow some help from a few new(?) allies—to get home safely this time. There’s a strange enemy on the horizon, but perhaps the only thing harder than fighting yourself is fighting someone you love...

Koutarou at last makes his return to Forthorthe, although it’s not in a very glorious fashion. Stranded on Planet Alaia with Theia and Yurika, he’ll have to figure out a way to use the limited resources they have to get past the imperial troops everywhere if he ever hopes to make it back to safety and the rest of their friends. Fate has a few familiar twists in store, however, as the coup d’état gets off to an ugly start and their enemies show their true colors.

Things have finally quieted down for Koutarou and the Corona House crew, meaning it’s time to kick back and have a little summer fun! Things start off at the beach where swimming, volleyball, and a test of courage are all on the menu. After that, there’s still plenty more fun to be had at a local festival and the amusement park. But when summer vacation draws to a close, Yurika’s worst nightmares come true... And what’s this about a surprise visitor at the apartment?

Koutarou has sunk into despair. He was given the agonizing choice of saving either Fasta or Ralgwin, with the other losing their life. As a result, Maxfern was resurrected, leaving Koutarou at a loss and full of fears. What will be the catalyst for his recovery? The girls of room 106 struggle to reach out to him, but it’s an unexpected friend who pulls Koutarou back from the edge. Once out of his slump, he resolves to take action against Maxfern. In order to find any leads on their enemy, Koutarou, along with Maki and Nana, infiltrates an enemy organization!

In this special collection of stories, new and old friends alike appear. Shizuka tells the story of how she lost her parents. She also comes to learn of the very special power that's been sleeping within her, and just what consequences that has for her... waistline? Yurika goes on a little quest to try and find herself, or rather, herselves. And finally, the story of how Koutarou knows Theia's mother.

Just starting high school, Koutarou is moving out on his own to take some of the burden off of his widower father. Lucky for him, he's found a room at Corona House. It has a great landlord, it's not too far from school, and best of all, it's dirt cheap. It really is perfect... except for the strange girls that keep appearing to try and take it over! But even as room 106 turns into a battlefield, Koutarou isn't willing to give up his apartment without a good fight. The invasion begins!