If you are watching this anime for romance, you will likely leave satisfied. However, if mystery or sci-fi elements attracted you, there is much to be desired. With the manga nearing its end, there is no material left for a second season. So most of the questions regarding the sci-fi elements remain unanswered, which is frustrating. Given that sci-fi and mystery make up roughly half of the anime, I can't put a "recommended" tag on this one. As for the art style and music, both are easily a 9/10. It's still a decent romance anime with unique setting, hence the 7/10 rating.