Well, at least, I believe it's DAI...
Um.. all I know is, the PV has two main characters. A 20ish female and a 30s/40s man. They both have these key chains (the man has a little cloth doll and the lady has a bead thing). They live life, and then the keychains break. They sit on swings, and get new keychains (?).
May I ask if anyone knows what this song is called, and if there's a translation for the song? Have a lovely day!