This is an 'love adventure' game which in Japan basically always refers to visual novels. This is an 'immersive' one because it has 3D graphics, full voice, animations... but fundamentally will be 'you' facing the girl and dialogue, as Sakuda said in the TGS stream. Just a more sophisticated...
I've been playing some Tekken recently and I would basically agree that DOA has the animations and maps (counting interaction) but they fell behind on the character models, especially after you count all that bloom. Which I guess leaves SC6 the neglected child. Hiroaki is almost certainly lying...
The girls talking is indeed the best part. That's why they ought to have a special episode where the owner is assassinated, complete with Scanners style head explosion. Then the girls take the island over themselves and run it in a worker's council.
I checked some of the episodes put up on Youtube.
Basically, Tsukushi is, as another poster said, an introverted sketch artist who went to the island to find a model for her in-progress manga. She's also very excited by the prospect of being super-close to beautiful girls and possibly even...
What exactly is so interesting about Leon? Interesting enough to forgive his painfully cliched 'my wife dead' angst? I've only seen assertions that he's good, kind of the genderflipped Momiji fans. Gen Fu had a lot more potential but it'll never happen given how they clearly want Eliot in his place.