It's one of DanGames... games, I got my Roommate Pregnant. Their Daz Maid game is here, but Summer Secrets one of their other game using these models wasn't allowed.
Edit - Couldn't remember the name, but Luck Son uses the same types of models.
I saw DAZ models like these.
Also people here doesn't use much various soft. Usually it is: rpgmv, daz, renpy, unity. I don't put honey select engine here because it's not truly 3D software.
Blender is used to creat models, but rendering is mostly done in DAZ because of Iray engine.