Hayate no Gotoku! Can't Take My Eyes Off You - episode 11 - 12 Dec, 2012

Everyone gathers together gladly to help Nagi search for Hayate. The girls try to figure out the mystery about the Black Camellia, the woman Dolly, the incident from 13 years ago, and Hayate's strange behavior. When Izumi and Hinagiku mention that Hayate got stabbed the previous night, Nagi remembers something that Yukariko said about her "father", and comes to a conclusion. Ruri appears and Nagi asks her to bring her Dolly's ring as Hayate's life depends on it. Nagi orders Klaus to deliver her mother's wedding ring over immediately then lends it to her friend, Ruka Suirenji, so Hayate will notice the ring on Ruka's TV interview. Ruri finds Dolly's ring and receives an email to meet at the Starside Hotel. Tonight at Ruka's concert, Nagi's friends go there to enjoy the show. Hayate and Yukiji arrive at the hotel. Hayate goes into Ruka's dressing room and found a note written by Nagi waiting for him. In the wedding hall, Nagi reveals the Black Camellia is a sword that exchanges a person's soul and what happened 13 years ago, and thus Hayate is now Shin Hayek—Nagi's father! Shin sat down with Nagi and talks about Yukariko. Dolly shows up with a captured Ruri and demands for the Black Camellia, but Nagi and Shin explain that her beloved "King" died 13 years ago in Shin's body and Hayate is inside the clock now. Shin claims for his ring back that signifies his and Yukariko's eternal love. While Yukiji beats up the thieves, chaos rises above her and Maria caused by Dolly refusing to believe her king is dead. (Source: Wikipedia)