Great game!!
Some things regarding MC's personality seem a little weird. His personality being a cop and the personality back make him seem like two different people. And it makes it a little weird how he can stay away from his daughter for so long (after 16 years he can't afford to have her live with him? or is it because he can't have her there while he focuses on his search for Antonella? In that case why is he wasting his time being a drunk, junkie and spending his money in whores? Spending 18 years away from his daughter seem like too much, being Osaka and Tokyo so close.
Then Amber tells him: "You know what, MC? Nah, screw it. Sometimes you act like you've never been laid in your life." And she is completely right. First he is a hardcore dude in Osaka and back home his little sister can play him like a fiddle.
Some typos or possible suggestion for edits:
Antonella: I don't know if sometimes you're just dumb or too slow with the uptake.
Sometimes I don't know if you're just dumb or too slow on the uptake. (think this sounds better)
MC: In a way, I understand your grandfather. Leaving you in charge with your grandma was a mistake.
Leaving your grandma in charge with you was a mistake. (think this sounds better, the other way sounded like they were both in charge of something)
"Reply (to) her" one of the options when talking to Madison (word missing)
Madison: Who in their right (mind) would support a fat creep like Amber! (word missing)
MC: Amber, can you stay awhile (think in this case is "a while"), please.
MC: "I've only been here for a day, if that, and I already there's drama... It's hard to describe it."
and already there's drama... / and there's drama already ... (last one sounds better IMO)
Mom: Forget what this old woman said, I don't want you to think any badly of me. (not sure the any is needed)
MC: IIf you're up for it, let's chat and clear our heads. It might do us both some good. (extra I on If)
MC: "I didn't think I would ever see those two words together." ( this sounded a little weird, considering he doesn't seem to know her too much)
I think the events as he comes back home somehow lock you out of many interesting possibilities:
In the memories of the past we have a blank space between Antonella's birthday and MC returning home with baby Isabella.
So there are around 9 months of unaccounted time from the teenager years left to tell. But as soon as you return home we learn two things:
1 first time doing anything sexual with Amber is after the drowning event were she gives you a BJ
2 the sexual tension with the mom starts after this point.
This means that from the get go, in those 9 months we already know nothing happens with Amber and the mother. It seems a little wasteful, not only because their young models look great and its a shame nothing happens with them, but kills lots of storytelling possibilities, for example the possibility of Madison being actually MC's daughter and that the father suspects something and that is way he is so hostile to MC. It could not be the case, but now we can't even wonder about it, we know that is not possible.