Rito Yuki has more women in his life than he knows what to do with. As if it wasn’t enough to have three Devilukean princesses living in close quarters - now, alien girls from throughout the galaxy are enrolling in his school also! When the addition of a particularly strange girl threatens someone he cares for, Rito and the girls team up to fight an overwhelmingly powerful opponent!
A casual day becomes something more as a Devilukean drink has a particular effect on Sairenji.
Rito picks up a strange device that Lala dropped at school. The alien technology has an interesting effect that will leave Rito exhausted and a little mousy.
Nana retreats to her own private Safari to contemplate Mea’s true form and the words she said that may forever change their friendship.
Rito and the girls are ready to have a blast at the Summer Festival. But as Momo is enjoying rare time alone with Rito, a dangerous introduction is made.
The day after an awkward mishap, Rito bumps into Yui while boarding a train and another sticky situation occurs. Later on, Mea is invited to dinner at the Yuuki house.
Momo fantasizes about alone time with Rito, only to be interrupted by Nemesis. Later on, the bath becomes a hot spot as Momo finds Rito with someone unexpected.
Momo is concerned about the distance between Tearju and Yami, and she tells Rito as much. He decides to speak with Yami, but Mea’s contribution may be the tipping point.
Rito and the girls are enlisted to help out at the Tenjouin mansion. The girls dress up as maids for the task, but a mysterious sword turns the mansion into a battleground.
Lala wants to help Rito and Haruna get closer, but Momo’s plan needs Lala to be the first wife. Utilizing a dating sim, Momo educates her sister about expressions of love.
A vacuum Lala invented goes crazy due to Oshizu’s powers; it’s sucking up the girl’s clothes! Mea is forced to make a decision as the invention’s core threatens the school.
With everyone's acceptance of Mea, Yami is coming to a realization that will change everything; Nemesis capitalizes on this and pushes the situation to a breaking point.
Yami’s transformation takes everyone off guard; her goal stays the same, but nobody expected her methods. Mea resists against Nemesis’ hold on her body in an effort to help.