His grandmother is familiar with youkai, and was the one that told Yuuta about the Nobiagari that was sealed away centuries ago. She also told him about Kitarou and what they must do to get his help.
(Source: GeGeGe no Kitarou Wiki)


Nearly twenty years into the 21st century, people have forgotten the existence of Yokai. When a number of unexplainable phenomena plague adults of the human world with confusion and chaos, thirteen-year-old Mana writes a letter to the Yokai Post in search of answers, only to be greeted by Ge Ge Ge no Kitaro...<br> <br>(Source: Crunchyroll)

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