There are tons of romance games but not all of them make it here. There is one called "My life as a Maiden" with an effeminate looking guy ends up in all girls school and has a choice of 5 girls he can end up with. It's a sweet little story but no sexual content.
From here then.
Princess Evangile. It's another guy at an all girls school but he's a proper lad. He gets invited because some teachers and students want to open up the school to males too but need to see if they will fit in. Again he has several girls to choose from and a fan disk that adds a couple more.
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Do Love me Seriously. One of my fave series. The MC is a pretty likable guy and knows what he's doing while all the women are great too. There is a sequel and 2 fan disks with a third currently being translated that all add more girls to romance. It does take a while to play through them all because you can only pick one girl at a time then play through her stories. When I say girls to choose from I don't mean harem style.
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Magical Marriage Lunatics. While the MC can be annoying at times the girls stories are all great.
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Dharker Studios has a few games out with romance in them but they also have dark as fuck endings if you pick the wrong choices.
The Elsaverse series is fantastic and all romance.
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Play them in that order, that's the end of the Elsaverse series. They also have a few other games like Coming to Grips with Christine which is also on here and Pandora which isn't.
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That's more grooming than romance. It's creepy as fuck.