Difficulty set to normal.
This video covers the mission to retrieve Nagi, Being captured, the escape, and starting Phase 8. Here are the timestamps and notes.
0:00 The group find Nagi back in the Old OSF Hospital
1:16 Boss fight
4:26 After the fight, the group get overpowered
5:27 Yuito has a flash back
6:00 Yuito is captured, and gets an explanation of events from a researcher
8:52 The group manage to escape capture, and try to exit the area.
13:29 The group meet Karen on the way out
15:52 Wataru joins the group in the hideout.
20:38 Yuito decides where to go next.
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