Most visual novels have a heroine that has more screen-time than others, while some might even have their entire story built around a specific heroine. This tag is there to help find these plot-significant heroines. While not all examples of central heroines are as obvious as Usami Haru from G-senjou no Maou (a VN built around this character, with the other heroines only being "What if?" side-stories), the distinction should be clear. Don't use this tag if a heroine just appears more frequently than the others, or if you think that she is more important. The idea is to find stories that have one particular heroine at their center, not stories in which a heroine somehow manages to hog more screen-time than others.