It's implied, Remi's all grown up and she's talking to a picture with "Fate can't be changed" written behind it, so I guess Remi couldn't change the fate of Sakuya, who as a human, would eventually die of old age. Tragedy of long life is really sad.
...Just kidding.I'm heading out, Sakuya.I'll be staying out for dinner, so you don't need to worry about preparing anything.