Weeell, I did a run through with couple of endings. Kind of like what I expected: starts good, best at the middle, but after that it's way past point of absurdity where characters start acting like psychopaths or clueless retards.
Luca - standard asshole with a magic cock with bizarre childhood obsession with hurting Harry for ridiculous reason
Laura - hypocritical bitch who gets addicted to sex with former, but somehow still loves Harry. Then freaks out if Harry holds Aya's hand
Harry - clueless, indicisive, lacks confidence..but two women are in love with him for some reason?
Aya - half the time acts like a child/anime character, then turns into Batman-like strategic mastermind. And powerful heiress to Yakuza clan on top of that.
Endings are ok. There's surprising amount of revenge or "good" ( where Laura/Luca lose or reap some karma), but what's funny author
really went out of his way not to give Harry any kind of character growth or agency. So Aya does all the work, and shows up to turn tables on them.
So you have (
As for "good route", not sure what's there to be done. Imo, it would be better if there was a Dark Harry route, where he flips out, solo or teams up with Aya. So he could fail ( and end up in jail/lose everything), go full psycho, or get revenge but become corrupted ( where he ends up as his own version of Luca)