The term "visual novel" is vague, with Japanese and English definitions classifying the genre as a type of interactive fiction game driven by narration and limited player interaction. While the term is often retroactively applied to many games, it was Leaf that coined the term with their "Leaf Visual Novel Series" (LVNS) with the 1996 release of "Shizuku" and "Kizuato". The success of these two dark "eroge" games would be followed by the third and final installment of the LVNS, the 1997 romantic "eroge" "To Heart". "Eroge" visual novels took a new emotional turn with Tactics' 1998 release "". Key's 1999 release of "Kanon" proved to be a major success and would go on to have numerous console ports, two manga series and two anime series.