What software are you using to make the character models? I've been thinking of dabbling in Renpy and I really like how this game looks.
as an avid player of adult games, it looks like he is using DAZ. other alternatives are Honeyselect or Koikatsu to model characters.
Almost certainly Daz. In the scene where the MC visits his father, Sea's computer displays a Daz UI interface with an unrendered version of the scene loaded. Fun little "breaking the fourth wall" easter egg.
