Tomoki asks where Sugata and Mikako are, and Ikaros does a scan and then knocks down a wall panel to a room where Mikako's family and Sugata have been watching them the entire time to their amusement. When classmate spots in the sky an abnormal structure that resembles a black hole, he convinces Tomoki, childhood neighbor , and student council president to join him for an investigation at a. Tomoki, running out to the hills but uncertain where to go, is then fortunately accompanied by his friends. As the awakened Uranus Queen, Ikaros easily overpowers Nymph, but spares her life, telling her to return to the Synapse. Ikaros arrives to assist Nymph against Chaos. A flushed out Tomoki is taken to a wedding chapel. At night, Tomoki takes the strange object and builds it into a transforming panty robot pedal bicycle.
The second season is licensed by Funimation under the title Heaven's Lost Property: Sora no Otoshimono Forte, and has streamed simulcasts on their video portal. While flying Ikaros sees Tomoki with Sohara and goes to search for Nymph. Tomoki, being the only who shows up, witnesses a girl with wings falls through the hole, along with several large pillars, scaring him to death. Looking for what show an image came from? When Ikaros finds Nymph, the latter tries to talk her into returning to Synpase but they are attacked by the Harpies. Tomoki invites the gang to a water park where he peeps on the girls, who cannot swim to retaliate. Ikaros insists she is just a Pet-Class Angeloid, but Nymph disagrees and removes her protection levels.
Sohara heads off by herself, thinking back to when Tomoki tried teaching her, but soon finds herself far from shore. After Sohara trips and falls in class, Tomoki notices she is wearing panties with a dog print, but he subconsciously wishes she would change them. Calling herself a Pet-Class Angeloid from an unknown world called Synapse, she considers Tomoki as her master and tells him that she can grant him any wish. Astrea then managed to recover Ikaros with both of them pondering on what is actually love. Later, Tomoki and Ikaros return to find his house restored, thanks to Mikako's father, who likes Ikaros and respects her power. As the Harpies tear out Nymph's wings, Tomoki and the others arrive.
As she creates a gun and readies to shoot herself, Tomoki stops her and says it was only a joke. Their friends offer different suggestions, none of which proved effective. Nymph, first deciding to kidnap Tomoki, who is busy peeping on a couple making out, ends up working with him to raise money by opening a flea market booth with different ideas, none of which work at all. They finally do so while Ikaros defeats the Harpies. .
Tomoki then puts Daedalus's lock on the collar chain of Chaos. Spoilers All spoilers must be tagged. Astraea and Nymph each visit but Tomoki chases them out. Tomoko secures a bathhouse visit, and while the Angeloids monitor status, Tomoko has a field day accidentally fondling the girls, until the perversion blows out the transformation device. Sugata warns Sohara, Ikaros and Nymph about the new threat to Tomoki, but the two Angeloids are not concerned about the Delta-Class Angeloid , who has a lack of computational abilities, which proves true as she immediately bungles her attacks. Tomoki and his friends enter and find themselves in 's world, which is an adventure with dinosaurs and rolling boulders, while 's world takes place in a war zone.
Eventually, Tomoki discovers he may have a connection to the Angeloids' original world, Synapse, through his dreams. Tomoko escapes the hunt by hiding in the girls' bathroom, but is eventually trapped. Hot Spring Snowball Fight at 1. But the card activates, and Sohara's panties immediately come off and fly to the sky like a bird. Elsewhere, Tomoki finds Ikaros and walks her home.
He uses it for his lecherous activities and treats it like a brother, that is until Sohara discovers and destroys his friend. Sugata goes to the meadow where the cherry blossom is and recalls when arrived, associating the giant monolithic column with similar shaped pillars. Tomoki thanks Nymph, who begins to doubt her loyalty to her old master. However, the animals attack Tomoki and strip him, which gets him arrested. Sugata confronts her asking what she is exactly, but Ikaros does not know and just wants to please her master even though she messes things up. It is revealed that the forced Nymph to rip the wings off a bird she was keeping for his amusement. During practice, Nymph shows her music ability on the keyboard and gets praised by Tomoki for that, making Ikaros jealous, but the gang discover she has another talent.
Ikaros encourages flying and Tomoki volunteers, using a pair of wings that Sugata has crafted. After dinner, Tomoki stumbles into Mikako at an outdoor bath, who casually informs him that his trespassing violates a family law where he must be decapitated. At science class, Ikaros shows up as a guest teacher, with the subject of flying, while Sugata and Mikako sit in on the fun. Ikaros battles the Harpies and goes to full Uranus Queen mode, while Tomoki and the others try to break Nymph's chain. With Tomoki trapped in his house, Sohara and Ikaros go shopping. Later, as Tomoki scolds Ikaros not to risk her life like that, Ikaros begins to cry.
Hurt by the betrayal, Nymph protects Ikaros but is knocked down. Tomoki shares a story about how he was alone, and how when she and Nymph vanished he was so worried. While Ikaros shops for groceries, an impoverished Astraea and Nymph raid Ikaros's watermelon patch; when she returns they try to regrow the patch but transform it into looking melon monsters. Nymph finds Astraea and tells her to help Ikaros, but the Master orders her to destroy Nymph. Sugata talks with Nymph about Tomoki's kindness to her. Tomoki, clueless of what to do, moves towards Nymph, but she finds it embarrassing as well and flees.