Title: 【MAD】いつかの空と同じ 【凪のあすから】(Like the Sky from that Day)
Song: Perfect Day by Supercell
Anime: Nagi no Asukara
Video from http://www.nicovideo.jp/watch/sm22800776
Just uploading an English subbed version. If you like it, go over to nicovideo and favorite the video or the creator (Totori).