Hayate Ayasaki, the butler/bodyguard to Nagi Sanzenin, must accompany her to Las Vegas to pick up her late father’s belongings. Nagi then meets a mysterious girl with a hidden agenda claiming to be Hayate’s little sister. The Sanzenin family secrets will finally be brought to the surface when Nagi discovers the existence of a mysterious item that once belonged to her mother.
After a phone call, Nagi is intent on going to Area 51, a secret military base that attracts un-worldly things. Maria says it’s too dangerous to go, but Hayate only laughs.
Nishizawa sings with all her heart and strength, and her voice carries all the way to Tsugumi’s heart. Suddenly faced with being an older sister, all Nagi can do is cry.
Hayate and Hinagiku meet at the battle ground known as Hakuo Academy. Meanwhile, random items and happenings are all part of a clever plot schemed by Izumi, Risa and Miki.
Ruri, looking for a way to get closer to Nagi, buys some video games for them to play; Ruri asks about for recommendations in anime, manga and games.
Hayate and Yukiji go to lunch, Ruri and Sonia join them, but only one of them has any money. A thief appears to steal money and Nagi mistakes the thief for her sister.
Nagi visits the Violet Mansion to find Ruri alone and she convinces Ruri to admit her true intentions. A storm hits and they struggle to keep safe.
A treasure resides in America and Nagi and Ruri both want it. The problem is: everyone has a reason for wanting to go to America, but no one has any money.
Hayate and the gang rescue Ruri after she is abducted. They all travel to Las Vegas to retrieve the treasure, but it may be bad luck.
Hayate’s luck has gotten worse since he took possession of the Black Camellia, but then it gets stolen and the group must find it.
Hayate gets lost and Nagi is all alone. She begins to realize how important Hayate is to her, so she begins to look for him. Meanwhile, Yukiji gets Hayate to help her.
Nagi must find Hayate so everyone gathers to help search. When the truth about the Black Camellia is uncovered, everyone’s wishes combine into one.
Nagi must face danger in order to find Hayate, who is having an adventure of his own. Ruka’s singing ends on a spectacular note.