Help me find this anime

Hello.I saw this anime on youtube a while back.In this a girl is crossing the road when she suddenly gets pushed by someone.She's about to have an accident but a guy who was just behind her saves her.Now so many people were saying in the comments that it was the guy who had pushed her in the first place and then saved her.I am trying to remember it's name but can't remember it clearly.Can anyone help me find this anime?