How to see code executed line by line in the game window?

I have a function that runs in Start(), each time the I hit play and each time the level is re-loaded (to start the next Round in a Best of X style game). However it's pretty complicated (for me at least) and I'm having trouble getting it to work. Is there a way to have it execute JUST ONE LINE, me click a button to let it move on to the next line and execute JUST that next line, etc etc and walk through it to find the error?

My CS teacher showed this to us in BluJ for Java but I'm not sure if it's possible in Unity. If it matters, I'm using C# and the standard Monoscript compiler