Joined: Sep 2008
From Mal Background info:
“The original story was put on hiatus after the sudden illness and hospitalization in the Peach Pit duo, and subsequently cancelled by Gentosha. It was then picked up by Shueisha, as an alternative setting story, and title changed to katakana writing.”
As far as I remember the II part is still considered a sequel. So you read the first series and then continue on with the second. They are indeed connected even though it doesn’t look like it at first.