Another Day, Another Song! Let's Go~
Owari no Sekai Kara by Nagi Yanagi
Nagi Yanagi is a singer/song-writer and has been in the industry for a long time. She was the guest singer for "Supercell" and has released anime singles such as "Zoetrope" from Amnesia. Her elegant voice seems like it takes you to the actual world of the video you are watching. It's like you can even feel what the characters are experiencing. The end is just heart-breaking, the feels...but I can't stop watching and listening to this song.
Owari no Sekai Kara (Male Version)
Here's the male version of the song which I still feel it retains it's original soothing and emotional touch. For those fangirls who prefer male vocals. I still can't believe this is not an actual anime...I am already crying just by watching the clip.