Tomoki takes action when Ikaros, Nymph, and Astraea are overpowered in battle against Chaos. After the fight ends, it looks like peaceful days are ahead - until it becomes obvious that Ikaros still faces a serious crisis.
Sohara teaches Ikaros about the ins and outs of marriage. Meanwhile, Tomoki puts the final touches on his summer project: a massive network of periscope-like tubing that allows him to sneak a peek at girls all over town.
During the Summer Festival, Mikako organizes a fishing contest at the swimming pool. There's only one way to win: reel in the curviest catch! Later, Ikaros tries to find the best way to spend her allowance.
The time has arrived for Astraea to make a choice. Will she do the Sky Master's bidding and destroy Ikaros and Nymph once and for all? Or will she listen to Tomoki and find the strength to choose her own destiny?
After Tomoki learns that the girls at school find him undesirable and unintelligent, the gang takes part in a quiz to find out just how smart they really are. Meanwhile, in Synapse, a plan to destroy Ikaros and Nymph is taking shape.
When visiting Tomoki's dream, Sugata learns more about Synapse, including a shocking fact about their relationship with humanity. Later, Tomoki builds - and becomes best friends with - a bicycle-robot.
While Tomoki desperately looks for a way to control his raging desire for all things Angeloid, the gang grows more worried that the newest Angeloid to arrive on Earth poses a serious threat to Tomoki's life.
The gang plays the "Dive Game" to explore their dreams after Tomoki's recent vision of the mysterious angel. Upon returning to the real world, Sugata finds that the search for answers has only raised new questions.