Date or die!! Get naughty or humanity is done for! It's Mutsumi's turn to step into the spotlight! The soft-spoken Valkyrie finally gets to go on a date with Takuma, but idols are under a strict love ban-no dating allowed! That means they're gonna have to go incognito if they want to gain enough experience points to level her up. Will they be able to stay under the radar, or are both Mutsumi's idol career AND the world doomed...?

I want yours, so I'll give you mine. Christmas is here, and it's the valkyries' big chance for romance! As Takuma works hard at becoming a better lover, a determined Itsuyo plans to give him something very personal-something she can never take back. But unknown to them is the rapid escalation of conflict behind the scenes. The most evil of wicked gods, Loki, has her own schemes, and she has an insatiable appetite for both pleasure and pain!

The valkyrie sisters and Takuma’s hard work in bed hasfinally paid off...! With the ability to open the door to Niflheim at will, there’s only one thing left to do—prepare for thefinal battle. But with Gullinkambi down for thecount and Shino getting weaker by the hour, willthey have enough strength to save the day...?!

Gotta flirt to save the world!! High schooler Takuma Akutsu is terrified of human contact and just wants to live a quite life. Too bad he doesn't have a choice in the matter when nine Valkyrie sisters come barging into his home! They've tasked him with raising their level to fight off the monsters threatening humanity--and how will he do that, exactly...? By gettin' down & dirty to the max!!!

Do the dirty with a maiden and become a man. On the verge of being wiped out by the wicked gods' overwhelming power, the valkyries are in dire straits. However, just as hope seems lost, Takuma unlocks his powers of seduction and attains new heights as the girls' einherjar! It's a new day and a new Takuma, and enemies and allies alike are going to get creamed!

Wicked gods have lovers too! Ichika and Takuma’s date gets interrupted by none other than Loki! When this devilish goddess offers to spice up their date, will Takuma refuse…or fall prey to her alluring figure? Meanwhile, Mutsumi seeks advice from Niina about how to make Takuma happy—in bed. At the same time, Niina struggles to connect with Skuld on an emotional level… Then, on Valentine’s Day, the nine valkyrie sisters have a special surprise lined up for their boy Takuma!!

Souta and Rikka are officially boyfriend-girlfriend, but they still haven'tbroken the demon Zepar's curse. Then, one day, Makoto, who had seen Rikka's"grimoire," falls prey to the curse herself. She consults with Souta and theybegin to have a side relationship to keep Makoto's symptoms under control. Butthen Makoto leans into her curse and doesn't even want to be free of it?! Whenthe grimoire's curse catches Makoto in its clutches, Souta, Rikka and Makotoform a love triangle?!