Touko speaks with the detective Akimi about a locked room. In terms of forensic, a enclosed room applies to cases in which there were no witnesses.
One of the most recurring elements in the Kara no Kyoukai films is the bridge being destroyed. In The Garden of Sinners: A Study in Murder - Part 1 (2007) is a brief sequence in which features the bridge under construction in 1995. In The Garden of Sinners: Overlooking View (2007) says that the bridge is destroyed by a typhoon, the fight comes as a storm occurs in 1998. The bridge Appears still destroyed at The Garden of Sinners: A Study in Murder - Part 2 (2009) in 1999.
Timeline: July 1998.