Thanks to an intervention from a certain someone, Koutarou and the invaders are now forced to try and work out their territorial dispute peacefully. But when playing cards gets boring, scheming Kiriha and maniacal Theia cook up a plan. Their next battle for control of room 106 will be... the obstacle marathon for clubs at the school sports festival?! But won't the invaders all have to join clubs first? What happens when Koutarou decides there's something more important at stake than room 106? And how does a ghost even run a marathon?

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!

After getting back from Forthorthe, everyone was hoping they could spend their days in peace for a change. But as if the politics of the official Forthorthian invasion weren’t enough, something very strange and very unsettling is starting to happen around Koutarou and the girls. One mysterious disappearance becomes two, and there’s no clear cause or end in sight. Can they figure out what’s going on in time, or will Koutarou end up just like he was in the beginning—alone?

Koutarou and the girls prepare to chase Ralgwin back to Forthorthe, but one critical mission remains before they can leave Earth behind again—they must oversee the welcome ceremony for the next wave of intergalactic transfer students. Little do they know that someone is watching their every move from the shadows, someone with a keen interest in both Koutarou’s sword and Nalfa... Indeed, the Gray Knight is getting dangerously close the group and the truth about what happened back in the ruins. Will their rematch with him be their final showdown?

Inept with a sword, unable to ride a horse, and apathetic toward the empire he serves, Regis Aurick is a hopeless soldier who spends his days buried in books. Banished to the borderlands, he encounters a stirring young woman with red hair and ruby eyes. She is Fourth Princess Marie Quatre Argentina de Belgaria, known simply to Regis as Altina. “…Do you want to become my tactician or not?” Having sought him for his rumored strategic prowess, she aspires to reform an empire led by self-seeking nobles and driven to pointless wars, the legendary blade of an emperor, the Grand Tonnerre Quatre, at her hip. Continuously underestimated by her regiment, including her would-be tactician, the princess resolves to prove her worth beyond a shadow of a doubt—no matter the risk. Here is a tale of war, love, and politics, woven by the bookworm and the sword princess.

Meet Meme, the good-for-nothing daughter of the Demon World's mighty Summoners Clan leader. Her dad has kicked her out into the human realm to learn some responsibility, and she needs to find a home! Enter Sentarou Narigane, wealthy landlord of Kuroyuri Apartments. Suffering from the worst case of malaise, Sentarou offers Meme a free apartment on one condition: She has to be his entertainment!

Lately, Koutarou has been growing more and more suspicious of Kiriha. Claiming that she's come to invade the surface is one thing, but what on earth is she doing helping the neighborhood association clean up the city? Is this all part of some nefarious plan? Or is there something else going on? When Koutarou works up the nerve to confront her about it, she responds by... asking him on a date?!

The evil magical girls are finally making their move to seize the mana pool in room 106, just like Yurika's been saying all along! Koutarou crosses paths with an old enemy, and Maki is forced to decide whether she follows her duty or her heart.

Kaito Sena's life hasn't exactly been easy. Unfortunately for him, death isn't about to get any better. Summoned by none other than Elisabeth Le Fanu, the "Torture Princess," Kaito has to choose what he wants for his second life-be her butler, or die a long, painful death by torture. What is he to do but become her servant...and help her eliminate the fourteen ranked demons wreaking havoc in the world! See the original light novel come to life in this gritty manga adaptation!

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.