[Mazyrian]

Originally Posted by thewingedone

What kind of interactions?

Spoiler for light spoilers:

The DCI scenarios follow a route where Jun'inchi didn't hook up with anyone, though is close to Nemu and/or Kotori.
Nemu: Jun'ichi, Nemu and a bunch of heroines warp to DCII. They meet Otome/Yume (and never Yoshiyuki or DCII Sakura) and stay at Sakura's house, and help with the Christmas Party preparations.
Kotori: Similar, the warped ones are Kotori and her friends.
There's a little drama and then the H. Interaction with DCII cast is about null.

In the DCII scenarios Yoshiyuki finds a door in the principal's room that leads to DCI. With either the Student Council+Yume or his classmates they go there and get trapped in a sort of time-loop. They are helped by Kotori, Nemu and Miharu, and maybe some other ones that I have now forgotten.
Nemu gets kind of freaked out when Yume calls her obaa-chan, and decides not to inquire further.
Kotori and Nanaka try to make some sense of their familiar relationship and fail.