I have to admit its was a pretty cute and sweet ending for kouta but they still left out a fair bit.
** Spoiler Alert!!! click to hide or show**
mainly about that little girl who says that kouta has awaken that confused me
hopefully they will explain more about that in the next season (that will be the main focus of the storyline) that's really their only way to having a second season is if they go on about that little girl without her there wouldn't be much in the anime apart from alot of fan service