Koyo comes off as somewhat aloof, rarely showing emotional highs or lows. For some reason, he seems very interested in the heroine... He knows a lot about the occult and is good friends with Kureha. He and Sena are also childhood friends.
Urban Legend: Merry Mary
The typical version of the "Mary" legend is one of a strange girl calling you on the phone multiple times, each time claiming to be closer to you, concluding with "Hello, this is Mary and I'm right behind you!" However, the Mary of Narimigahama is called "Merry Mary" because the phone calls from this legend are typically calls from loved ones who have passed away.
