Meitantei Conan: Honchou no Keiji Koi Monogatari - Kekkon Zenya
English title: Detective Conan: Love Story at Police Headquarters - Wedding Eve
Japanese title: 本庁の刑事恋物語～結婚前夜～
Type: Special
Episodes: 1
Source: Manga
Genres: Adventure, Comedy, Mystery, Romance
Studios: TMS Entertainment
Duration: 1 hr 34 min
Rating: PG-13 - Teens 13 or older

The special contains the footage from episodes featuring Takagi and Sato, with a new narration from Conan and re-recorded line of Takagi and Sato.

In the end scene, Sato is preparing herself as the bride as Yumi approach her. Meanwhile, Takagi is waiting outside. Those scenes are leading to the events in The Bride of Halloween.

(Source: DCW Wiki)