I think people are a little overly harsh on this short series. I think maybe people are a little closed minded when it comes to sexual situations like this. But I found it fun and interesting. I really liked Makoto's personally and I enjoyed her journey, discovering herself. Although I do feel the end was a little rushed, overall I liked it and wished it was longer when I finished it. That's how I rate things, if it ends and I'm sad there's not more then it's good in my book.
Give it a try and don't take it too seriously, it's just entertainment after all.