Ryuji, Eriko and Rose were attending a party with many A class and above Lost Preciouses. They also meet a new collector who seems interested in Eriko; he tells her that if he finds out anything about her other earing then he will contact her. The guests were attacked by "Odd Eye", a half-beast Lost Precious thief that Ryuji had just seen in a magazine. Later at their home, she tried to steal Eriko's earring, but end up tied to Ryuji by a failed capture device. While waiting for the bind to vanish, they learn that her true name is Ai, and try to figure out who is making her steal, and why. The next day Eriko answers a knock on the door and it is the new collector who says he has found the other earing. He opens the box supposedly containing the earing and sleeping powder comes out of it, putting Eriko and Rose to sleep. He then tells Ai to follow him, putting Ryuji to sleep as well.

Ryuji wakes up finding Rose dressed up in his school's girl uniform saying she wants to go to school too. Ryuji agrees but makes her promise that she wont use her wings and fire. When they get to school, class is suddenly disrupted by by Bianca Alexandra Lou, a women sent by the society to evaluate Ryuji. She fires a SMAW at Ryuji and finds his physical level is 326 and his lost precious level is 120 . She seems slightly disappointed and says she will test his maximum lost precious level later. After a whole bunch of questioning, Bianca takes Ryuji outside to start the test. Ryuji needs to battle a Neogolem. After Ryuji severely hurts it and the Neogolem still doesn't shut down, Bianca realizes that there's something wrong with it and tries to automatically shut it down when it doesn't work, she climbs up the robot trying to shut it down manually. Ryuji and Rose engage and stop the Neogolem. At the same time all this happens, Eto figures out it's Ryuji's birthday the day after and tries to figure out what to get him for his birthday present.