Based on the short story "Ghost Toilet" from Toru Tsunemitsu's urban myth collection "School Ghost Stories." This was adapted into the children's book "Hanako in the Toilet: Scary Stories of Your School" (1993). Several artists then adapted this into the "Here Comes Hanako" manga; most of them also wrote the anime version, which was aired as a segment of the TV series "Ponkikki Kids." Episodes, introduced by Hanako, included "The Haunted Cinema" and "The Cursed Promise Ring." 

A short movie based on Japanese urban legend.

The story of the anime revolves around Hanako, a girl who lives in a supernatural world apart from our own. Hanako appears when schoolchildren are in trouble; she is a benevolent version of an enduring Japanese urban legend about Hanako, a ghost who lives in a toilet at the local school.
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(Source: Anime News Network)