This entry is actually the 4th game in the extremely popular AMNESIA otome series, but it's also the only one that's managed to make it to a PC port. Considering its fan following in Japan and an enthusiastic Western audience that has begged for a stateside release for years, it's no surprise this game shot to the top of the list.
You play as a college student whose consciousness is inexplicably and accidentally merged with a spirit named Orion while he was traveling between worlds - and in doing so, all your memories, your personality, and entire sense of self is lost.
Orion is your constant invisible companion, staying by your side until you can recover your memories and adapt to the strange world you no longer remember. Oh, and you're also surrounded by a gorgeous yet somewhat problematic bevy of men who happen to be crazy in love with you. Who to pursue, who to win?
You can check it out on Steam here.