I like this type of anime where the story unfolds slowly and you get the answers of the questions that you asked while watching. Also this anime is full of hidden clues.So try to remember every seen. Trust me, it will help you to fill the story & to better understand it. The art style was very good, the character building was on point, the story telling is good. The science explanation was understandable. Those who love science fiction & love romance anime with cute couple then this is the one. But you need to watch the 2nd part(prequel) to understand it fully. Don't skip the 1stpart.