Sunday, December 13, 2015
This day is covered in these episodes:
This date is a guess, the events could have happened on any day between December 8 and December 29.
Dubbing for the episode takes place at 20:00.
Episode 13 dubbing from 20:00.
Meanwhile, Misa finishes her work on the 3D jet. This day should lie in about the middle of the timespan mentioned above, since Shimoyanagi mentioned that they need the jet within a week.