The ending theme is You were the Sky (君が空だった kimi ga sora datta?) by Aki Misato, though episode 15 uses It's only the fairy tale by Yuko Miyamura.
The closing music for the series is "You were the Sky" (君が空だった kimi ga sora datta?) by Aki Misato, but episode 15 utilizes "It's only a fairy tale" by Yuko Miyamura.