Nymph is sent back to earth, and her bastard master implanted a timer on her so that she explodes like a bomb if she doesn't fulfill her mission of capturing Ikaros within a certain period of time. Nymph gets a taste of the main cast's life and basically is turned to their side and ignores the order.
Heaven sends down a pair of angeloids called Gamma and they basically give Nymph a beatdown and rip her wings off.
Tomoki, Ikaros and crew arrive (cool scene, seriously). Ikaros reveals her true nature to defend Nymph, but Tomoki says he doesn't mind her being a weapon so happy moment there. Tomoki, Sugata, and Sohara try to break Nymph's chain before the timer counts down as it's electrocuting them in the process, while Ikaros kicks the utter crap out of the Gamma angeloids. They run off and Tomoki and the others have managed to sever the chain, freeing Nymph from her evil master, and so she becomes a part of the main cast and moves into Tomoki's place.
Some chapters involving some kind of alternate world where people are living in some kind of matrix-reality, and Nymph's feelings for Tomoki start blossoming and same for Ikaros, who has no idea what it is she's feeling for her master.
The bastard dude sends down another angeloid, a type delta combat angel called Astraea; who's supposed to be really strong, but she's adorably stupid and clumsy as well. Seriously, she's such a darling. Her mission is to kill Tomoki, and basically we have several chapters of her trying a few times and eventually failing to the point where the bastard guy says she can't come back to heaven until she fulfills her mission. Astraea moves in with Sugata and joins his life of poverty.
In heaven, the bastard guy is attacking the hideout belonging to the angel woman in Tomoki's dreams, and she tries to warn Tomoki through his dream. Heaven sends down a new type of angeloid, named Chaos, who confronts Nymph first and basically mindf*cks her by impersonating Tomoki.
Ikaros comes in to save the day but when Chaos transforms into a fake Tomoki, she throws Nymph away to safety as Chaos, in Tomoki form, forces Ikaros to start attacking herself.
Nymph is elsewhere and Astraea meets up with her. Nymph tells her to go save Ikaros, but the bastard dude orders Astraea to kill Nymph, until Tomoki shows up and becomes the icon of pimpage (I cannot find words adequate enough to describe his awesomeness), making Astraea fall instantly in love with Tomoki. She flies away in a tsundererrific fit going all, "I'll kill you when I get back, I swear!"
Astraea flies off to where Chaos and Ikaros are and attacks Chaos. The bastard dude goes "WTF are you doing you moron!" and Astraea in a most epic scene of badassery, goes, "STFU!!!!" and breaks her own chain with her bare hands. And then proceeds to lay the smackdown on Chaos, until Chaos opens up with a huge beam attack and is about to overwhelm Astraea when Ikaros comes up behind her, grabs Chaos by the face, and blasts through the atmosphere at stupidsonic speeds towards the ocean and meteor-bombs Chaos into the depths of the Pacific.
Astraea saves Ikaros from plummeting as well at the last moment. All of them return to Tomoki's place where there's a touching moment between Tomoki and Nymph, with his saying that he'll be her master despite her being wingless to show her that such a thing doesn't bother him at all. In the midst of this, a miracle happens and Nymph's wings have come back. She picks Tomoki up and flies off into the sky all happy and such and we have this cool double-page of all three angeloids flying through the sky with Tomoki.
In the meanwhile, Chaos is at the bottom of the ocean, immobile due to the immense pressure, contemplating the meaning of love and developing a psychotic (as if she weren't psychotic enough in the first place) case of sadistic love by tearing up a poor innocent deep-dwelling fish.
Dun dun dun, will she return in the future?