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.

Koutarou and Clan are working their way back home from their interstellar adventure, but they have to make a pit stop about ten years off from their intended destination. As luck would have it, they encounter a young girl right after they land. Worried that she might have seen their spaceship in action, Koutarou decides to dig a little deeper. Things take an unexpected and heart-wrenching turn, however, when he realizes he has more in common with this girl than he initially thought.

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!

 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 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?

Now that the invaders have come to an understanding of sorts, things are going smoother than ever in room 106. Spring is in the air--tulips, friendships, and potential romances are all about to burst into full bloom. Koutarou and the invading girls have never been happier together, but nothing lasts forever. Things turn dark quickly when they find out that they're going to have to say goodbye to one of their own... and soon. Without even any time to prepare, will the bonds they all share be enough to pull them through?

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!