Noooo! There can only be one Tomoko.
Besides, judging from the Prologue Audio-Drama, she is going to be the "quiet" elder sister of the male protagonist. Yes, that's right. The
elder sister. Not to mention that her hairstyle is totally different.
ADD] Probably the one thing that threw me off the loop was Takeshi who seemed to be using "flash-lighting" and a sword against Matsuri. This is the same guy who is the guardian of the "loopy" girl who likes to hide in dustbins.
So this probably means that Matsuri is the girl that Takeshi is looking for.
Connecting the characters in this preview to the Audio-Drama is fun for speculation.
Natch.