It's a dead world with nothing really much to do, you could finish exploring it in sub 3 minutes. It was designed that way and it is what it is, however... feels lacking. Some bunch of NPCs with two of H-Scenes for each, no development in any way, one H-Scene is ~2-3 almost identical CGs. NPC are more NPC then real NPC in games. Could be something interesting if there was a plot of some kind, maybe character development for... non-playable characters, it's a good trope. But there was nothing. And hentai was not that good anyway, thus 2/5 - Poor.