Harem: (
Story/Location) This is a sub-genre of the "
Romantic Comedy" genre. To qualify you have to have a single, dateless, nice guy who suddenly finds himself surrounded by a bunch of hot girls/women who are interested or attracted to him to varying degrees. The male lead may also live with many of these girls.
Short: (
Type subgenre) This category contains titles whose playing time is unusually short as compared to the length of standard anime episodes (which are roughly 20 minutes plus intro & trailer).
