Finally got a chance to finish reading kokoroiyashi-hen...actually didn't realize it was written by the mangaka of Karin, Kagesaki Yuna, until near the end. I thought it was weird that the art looked similar and have the similar bitter-sweet ending to the story. (it's been a while since I read Karin)
In general, I would say that it's a weirdly good original arc. You get your spoiler fes at the start, events happening here and there, and a nice ending. At least it's better than some of the other original manga arcs out there
Hirukowashi-hen has also started...I think it's pretty good so far. Highlight of the first chapter is definitely those two colored pages