Asuna is not connected to any of the other characters except Ash. The time and place where they can be found is in the hints for the secondary events. The cafe opens after several of Touka's events, and she can be found in the school library on Monday, Wednesday, and Friday evenings. You can find the rest on the phone.
thanks for the the info, i mustve gone wrong somewhere though bc touka wasnt showing up at the library at all and neither was any of the other characters at their allocated side quest times but its alright, i sped through the game back to where i was on a new game file but did a few things in a different order and its working now :)