When you're finished playing Kokkuri-san (which is sort of like the ouija board, but it only summons one spirit, Kokkuri-san) you have to spend the ten yen coin (around 7 cents) in 24 hours (as well as dispose of the board and close the window/door you opened to begin the game). You don't have to spend the coin by itself though, you just have to make sure to spend it.

These are Kuchisaki-Onna!Sonic and Tomino's Hell!Shadow, both based on Japanese urban legends (though Tomino's Hell is a real poem, its effect on people is the urban legend). I love Japanese horror, it's more psychological than gory. Combined that with Sonic and my personal quest to be known as that one artist who draws Sonic and Co as monsters all the time, it's a match made in heaven. I plan on drawing these versions a lot more soon.