Konohana was written by Matsumoto Drill Kenkyuujo, probably best-known for the ero-manga Alignment You! You! It was briefly serialized in Champion RED as an all-ages manga despite the fact that it very, VERY clearly is not. It only made it to one volume before someone finally noticed and pulled it from circulation. It got a sequel in the form of Kono Yo Hana ni Suru Tame ni .
The synopsis above, as well as the images themselves were reader submitted!
Konohana (1 Volume, Complete – sort of)
Supposedly there are two additional ‘uncompiled’ chapters that are said to exist out in the ether. I’m guessing this compilation does not include them.