Since I don't know the details of 'watch bans side story', it's hard to determine its significance. It could be significant within a specific community or group that has a unique relationship with watches and bans.
Well, 'watch bans side story' is rather unclear. It might be a unique or local story. Maybe it's about a particular place where there were bans on wearing watches for some strange reasons, like in a very strict school or a conservative community. However, this is just speculation.
You might be able to catch it on cable TV channels that show classic movies. Sometimes they air West Side Story. Another option is to rent or buy a digital copy from online stores like iTunes or Google Play.