Harem Collector is free turn-based adult-only fantasy RPG, based on the RPG Maker engine. It takes place in fantasy world filled with various creatures, magic and (mainly sexual) slavery. The player controls a lusty, arrogant adventurer. He is officially called Hero, but the player can use one of several names or a custom one. He wants to live a great life in luxury and assemble a harem of 151 pretty girls. Each “collected” girl - some join due to a magic slave collar, some join voluntarily - has some sex scenes, usually based on bondage actions. All of them live in the Hero’s newly acquired mansions in various parts of the game world. Some of them can be part of Hero’s team and some other characters, like Felix, an apprentice from the Guild, can join too.
The game uses classic RPG Maker gameplay with four characters that gain experience and fight in team-based, turn-based battles. Characters perform different actions such as attacking or launching spells. There are no random fights. Hero can travel almost freely through the game game world and events are triggered for example by accepting a quest from the Guild.