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Visual novels are interactive stories. They focus mainly on character development and plot rather than action and gameplay mechanics.

Inspired by (or directly containing elements of) storytelling and visual design that are otherwise most commonly seen in Japanese animation.

Set in a fictional universe, often (but not always) with fantastic or supernatural elements, alternate worlds, magic and monsters.

An otome game is a story based video game that is targeted towards the female market. Generally one of the goals, besides the main plot goal, is to develop a romantic relationship between the female player character and one of several male or female characters.

http://en.wikipedia.org/wiki/Otome_game

Either prominently containing or entirely themed around romance, this genre is typically focused on interpersonal romantic relationships between characters and the player.