Rewrite and 07th Expansion?

[Zodai]

So, I've recently finished Rewrite.  Yay!

 

That said, during the credits I noted references to 07th Expansion being listed.  I'm not really sure how they were involved, but does anyone have information on this?

[Down]

Ryukishi07 wrote a route (Lucia's). I redirect you to wikipedia to know more about how writers got involved into Rewrite.

[Silvz]

Yeah, that /\ Rewrite had 3 writers, if I recall correctly. One of them was Ryu-chan :3

[Zodai]

I see.  Considering I actually thought Lucia's was one of the better ones of the group, it feels good knowing he wrote it :3

[Zakamutt]

Ixrec actually translated an interview with the three writers for rewrite. Check amaterasu blog or something...