Maria consists of a series of stories, compiled into one volume. It's based on the story Daddy Longlegs. However the manga showed itself again in "After Maria" which is in the back of the Third Volume of the Cherry Project. That story was jointly done by Takeuchi-sensei and Neko Nekobe (Goldfish Warning).
Overall, it's a cute romance story, and sets up for much of the later flowy page layouts, like in The Cherry Project and Bishoujo Senshi Sailormoon.