I sort of get what you're saying.
As for Haraguchi/Shinoda she is a guest character. Although she has that important information about the Gate and all of that, watching the preview should clue you off into something.
There's some info on what appears to be the next bi-episodes' guest characters, from the mag spreads
Spoiler:
Mai Kashiwagi (柏木舞) [ep 3, 4??] Character voice:
Megumi Nasu
- A 14 year old schoolgirl.
- Her parents divorced and then her mother died. She took on her mother's surname.
- She is in the custody of Tahara Kouzou, her father, but does not get along well with him.
- There is a certain secret about her that even she doesn't know.
Kouzou Tahara (田原耕造) [ep 3,4??] Character voice:
Kousuke Meguro
- Mai's 42 year old biological father
- The only remaining survivor of a group of investigators sent into Hell's Gate
- Now he works in a relatively slack job as an advisor to a factory
- Hei and the other rival organisations are all after the research materials he brought back after going to the Gate.
Another thing about the stars and whatnot explained: if this wasn't obvious enough as it is, it's confirmed that the stars are linked to Contractors. When a new one comes about a star appears in the sky and when one dies the star disappears as a shooting star.
There's an astrology department that reads these stars and tracks the movements of Contractors by linking the stars with the right people. (And also has hawt technicians like
her) However they haven't been able to find out who's behind the star labeled "BK201" (and that's actually Hei). This information is passed onto the police... so take notice in the episode when they focus on a twinkling star in the sky.
And also remember that Hei does a lot of stargazing... Memories of a nostalgic past (see first part of ep 1) or tracking other Contractors down?
So can you imagine if Hei were to get into killing-machine mode and finish off all the contractors it would be a truly dark, starless sky...