I can tell you why the title is written as:
Heavy Rain
It's because David Cage names
every one of his games with the title/subtitle mantra.[footnote]I know what some of you are going to say: "But what about
Fahrenheit/Indigo Prophecy?!" Same applies. They just split the title up and used the real name for Europe and the subtitle for North America.[/footnote]
Detroit: Become Human.
Beyond: Two Souls.
Omikron: Nomad Soul.
It's his thing. So this means that
Heavy Rain's
actual title is
Heavy, with
Rain being the subtitle.
Yes, that's right people.....David Cage made a game about a murder "mystery", filled with lots of character "drama", and called it
Heavy.
Let that sink in...