It's like the thing had gone from dating sim game to chick flick., and yes there are definitely sex scenes/nudity in Rumbling Hearts, these I would say are borderline fanservice though since they help the story along but I wouldn't argue if someone thinks they were, since they might rate in somebody's book as softcore porn.
Dating sims with nudity
Such a list would be very, very long, especially since many hentai series are based on those types of games.
In the West, the term dating sim is also used to classify what are known as visual novels in Japan.
seen a couple anime based off h-games, and mostly they were rather less ecchi than many other series I'd seen.
Even School Days, in which the characters actually have sex, was decidedly less fanservice-y than, say, Vandread or Burst Angel.
I'm of the impression that what gets the animated adaptations are actually visual novels, for the simple reason that the stories there are already neatly packaged, so the anime writers will practically only have to select a path that they want to animate... And while the games really do have eroge content, there isn't much fanservice in terms of the typical 'pantsu shot' or 'naked apron' stuff.
Even Tokimemo ~Only Love~, an adaptation of Tokimemo Online (to some extent), has little fanservice.
And while the games really do have eroge content, there isn't much fanservice in terms of the typical 'pantsu shot' or 'naked apron' stuff. So many people running around: "It came from an eroge! Furthermore they moved the male and female leads from the game into the background such that they'd been reduced to almost cameo level roles in the anime.
If I recall there wasn't one iota of fanservice in the resulting show.
Parents need to know that this is an adult world (the dating world here includes the opportunity to engage in casual sex and extramarital affairs), and there's really not much that's appropriate for or of interest to tweens and young teens.