The opening video introduces the characters and not much else.
Yuna introduces herself to the player.
Aya-sempai is a bit aggressive for Yuna's liking.
Hm... Should we take a look around, or go find Souji?
Most of the other robots are obviously robots.
You can move around the hospital using the map.
You can ask each character about lots of different things... or at least, everyone else you've met.
You can review Yuna's data banks for the characters you've met.
The more you learn about each character, the more their bio fills in.
Souji performing maintenance on Yuna.
Reviewing the conversation log.