Core Viewpoint - The film "731" has achieved significant box office success upon its release, breaking multiple records in the Chinese film industry, particularly in terms of single-day ticket sales and screening numbers [1][4]. Group 1: Box Office Performance - As of September 18, the film "731" has surpassed 1.6 billion yuan in box office revenue, becoming the highest single-day grossing film in Chinese history [1]. - The film set a record with 256,000 screenings on its opening day, breaking ten historical records for single-day screenings and total screenings on the first day in Chinese cinema [4]. - "731" has also claimed the title of the highest-grossing war film in China for September 2025 and the box office champion for the 37th week of 2025, achieving a total of 34 milestone records [4]. Group 2: Film Details and Significance - The film, which runs for 125 minutes, focuses on the atrocities committed by the Japanese army during World War II, specifically their bacteriological warfare research in Harbin, Heilongjiang [4]. - The premiere was strategically scheduled for 9:18 AM, symbolizing a "warning bell" to commemorate the historical events depicted in the film [8].