Known as the last game originally released for PC-FX, First Kiss Monogatari has the player assume the role of a high school boy (whom the player must name himself), whose parents left town one month before his graduation. So during this month, he will live by his parent's friends, the Orikura family, which consists of two sisters, Kana and Manami, and their mother, a young and attractive widow. Yes, you've guessed it - the hero (and the player) can conquer the hearts of all three, plus a dozen more lovely girls that populate the city of Akitsuki - and that is pretty much what the story is about.
First Kiss Monogatari is what is commonly called a "visual novel", with even less interaction than a typical Japanese adventure with its menu-based commands. All the player can do here is to access locations from the town map, and sometimes choose a dialogue option. The locations with a "girl event" in them are marked with a heart on the map. Depending on the decisions taken by the player, the hero will end up with one of the pretty girls.
Despite suggestive themes and some mildly erotic images, there is no nudity in this game.