This is a show that time will forget. The presentation from Madhouse is done well with a matching art style and OST. Storywise it's a different beast. Except for a single off shoot episode it's told in arcs with little connection between them and you often feel like there is something missing. So by the time you get to the last episode it doesn't really matter as this doesn't feel like an overarching story. There are plenty of plotholes and Ai is "special" so this gets exploited for the ending (everyone else only got a wish granted by God on the day he left). The show is about one-third of the source material but I doubt that anyone will rush out to read that. It was allright for a weekly 20 minutes but as a complete series it's not satisfying.