Sugata determines that Tomoki must be expecting a particular pair, so Ikaros and Mikako shop for a large selection of panties while the boys escort the young girl handcuffed home, during which Tomoki shields against any accidental exposure. The finals pit DuPants against Mikako in an. Ikaros enjoys herself but is fearful of how Tomoki would react if he knew the other side of her. Tomoko manages to snatch some of the girls until Sugata baits the buxom Astraea with some snacks, but Mikako steals the catch. However, he keeps having weird dreams and asks all of his friends to help him investigate the cause.
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. He then finds himself in a room full of encapsulated humans, with Angeloids monitoring, and he questions his humanity. They split up to search for food and items, but Tomoki eats a and passes out. After Tomoki tells Ikaros to act more human, she overhears a couple talk about lying as being human, so she proceeds to tell her friends the opposite of what she means, leaving Tomoki and Sohara depressed. Nymph generates new wings and uses a hacking field to boost Ikaros and Astraea's combat powers. With Sugata and Mikako presiding, Ikaros appears dressed in a bridal gown. Tomoki wakes up and everything is back to normal, except Ikaros is here to stay.
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. When Tomoki peeps, the girls aim mirrors to blind him with sunlight. Tomoki shares a story about how he was alone, and how when she and Nymph vanished he was so worried. As the awakened Uranus Queen, Ikaros easily overpowers Nymph, but spares her life, telling her to return to the Synapse. After Tomoki is released, Nymph states the date should end with a kiss, but while Nymph goes ahead to get a kiss from Tomoki, Ikaros, unable to bear the sight of that, flies away stating that her reactor was in pain.
The gang participates in another festival at the Satsukitane shrine, but the theme this year is. Later, Astraea serves Tomoki his meal but forgets to poison it. He overcomes his fears and rescues this girl, who calls herself. Elsewhere, Tomoki finds Ikaros and walks her home. Mikako offers to help train her against Tomoki. The next day, Sugata comments how Astraea is not allowed to return to Synapse until she kills Tomoki, something he pities on her about. Tomoki, clueless of what to do, moves towards Nymph, but she finds it embarrassing as well and flees.
The next morning, Tomoki finds they are on a plane to an uninhabited island as an alternative punishment instituted by Mikako. His childhood friend Sohara Mitsuki worries about this and decides to seek the help of Eishirou Sugata, an eccentric sky maniac. Tomoki has Ikaros speed up the current in the that the girls' bikinis come off, although he nearly drowns himself in the process. Later Tomoki handcuffs Sohara to force her to grant his wishes. He witnesses the arrival of a new Angeloid, who seeks Tomoki with deadly intentions.
She gets the ingredients except for meat, for which she buys a cute baby chick, leaving them with cooking vegetable curry. Nymph then reveals that Ikaros is an extremely powerful Angeloid known as the Alpha-Class Uranus Queen. Recruiting the New World Discovery Club's first members, Eishirou schedules a time to meet up in order to observe the mystery in the sky. The next day, Tomoko blends in well with the students, and even becomes popular with the boys, despite acting like an ideal female character. With a ten million yen prize, Tomoki debuts as Mask DuPants, much to the guys' cheers and the girls' jeers. The final question, a freebie repeat of an earlier question about the ethics of an open door to the girls' locker room, causes Tomoki to struggle between choosing the correct answer and being a man.
That night, Ikaros wants to know how Tomoki really feels about her. Mikako then gives him a choice: he can pick Ikaros, Nymph, Astraea, or Sohara, all of whom are dressed as brides. However, Tomoki has one more perverted task, which is to transform into pool water so he can fondle girls during swim class. With Sugata hosting and Ikaros supplying the questions, only Nymph does well. After Sugata helps them, he informs them that the black hole may still be hovering in the sky, but Ikaros sees no sign of this. The girls then enjoy their bath with the Angeloids, but both Ikaros and Nymph seem concerned.
While Tomoki gets a drink, Nymph compares the caged animals to themselves and their collars. 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. Tomoki dismisses Ikaros, who meets up with Nymph, who asks her how it felt to slaughter people like she used to. Ikaros is manipulated by one of the hallucinations, ordering her to kill Nymph, but instead she tosses her far away from danger. Sohara tries the panties, but they are all sent flying, except for one that is a similar dog print as her original, releasing Sohara from the handcuffs. Nymph and Sohara jump at the idea of going with Tomoki but agree to let Ikaros go instead.
However, the animals attack Tomoki and strip him, which gets him arrested. Nymph gets an idea that they should go on a date, and it ends up with Tomoki dating both Angeloids. Sora No Otoshimono Forte intends to be about the fanservice and fun with a decent dash of seriousness to try and tie it all together. Later, Tomoki makes one last mad dash out of the house, but bumps into Sohara, landing his face on her crotch and causing another explosion. 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. DuPants gets the advantage until another masked wrestler, implied to be Sohara, interferes and delivers a devastating on DuPants, who stands but it is announced that he is already dead. In the ensuing fight, Tomoki, remembering his grandfather 's perverted advice, puts Astraea through his lecherous version of the.