White Day of Betrayal ~ Part 1

Episode of Detective Conan (Case Closed).

Synopsis
Conan, Ran, and Kogoro get invited to a white day party at Haido city hotel being thrown by Urai Confections, a large sweets company, on March 14th due to Kogoro co-staring in a comercial with Yōko for that particular sweets company, and getting her recommendation. On their way there, they encounter Sonoko, Sato and Takagi, and Shiratori, who all are worrying about giving or receiving gifts today from their special someone. As they arrive, they're greeted and shown into the main party room by company president Urai Taruto and his wife and vice-president Hoshie. Kogoro is quickly enticed by the all you can eat buffet table, then proceeds to make a speech soon thereafter. All the while, company president Urai makes some noise and falls to the ground. Kogoro is under the impression it's all an act based on what his wife says about him always doing something eccentric each year, but shortly they realise it isn't an act. When Megure, Sato, Chiba, and the Coroner get to the scene, the wife insists on getting a police examination as she was the closest and only one who could have, suggesting it was all a suicide as she wasn't a part of it. This is supported when they find medicinal wafers and a bottle of poison in the presidents car, as well as a half dissolved wafer in his mouth. Conan is certain his wife is the murderer, but is unable to find the means of her crime.