Hatena Illusion is a "lovely" anime that will shock every viewer. It is perfect for those that enjoy watching anime that have slow pace.
I wonder why is included tag ecchi. I watched all episodes and didn't find there even slightest track of it.
Story 2/10,
I would say that story of this anime is something that you can't easily appraise here. It is simple-minded with a simple plot. The whole story is nothing special. Every other anime out there has a better story.
Art 5/10,
Nothing too good, nothing too bad.
Try the first episode and then decide. Because it won't be better.