I think a great way to open up shenmue 3 would be to have ryo washing his clothes at shenhuas house. Just washing his jeans, t shirt and leather jacket and then hanging them out to dry by the shenmue tree. Not only would it give relief to the fans concerned with ryos hygiene and add realism, it would also open the game in good humour!
Just imagine the epic shenmue music playing, the sound of water splashing. Camera fades in to see ryo washing his clothes in a wooden bowl in shenhuas modest kitchen, wringing them out and then going outside into the morning sun and hanging them up to dry. The camera pans up towards the sky and an eagle flies overhead. The eagle gives its iconic shenmue "caaaawww caaaaaaawwww". The camera follows the eagle as it flies towards the sun. Camera zooms in on blinding sun and the shenmue 3 title screen fades in as the music reaches a crescendo.
The camera zooms in on the blinding sun shining brightly up Ryo's naked ass! The Shenmue 3 logo then appears over Ryo's butt-cheeks.
Then we see a hand slap Ryo's ass and it's Shenhua!
Seriously I see no reason why Ryo wouldn't be butt-naked in the solitude of Shenhua's house while he's washing his clothes.
16 years of living together made them VERY comfortable around each other.
But seriously the game needs to start in the cave... we can't be cheated out of that moment of exiting that cave and investigating the sword/giant mirrors again.