Kouyou

Personality:
Kouyou is a blunt and emotionally calm person. For some reason, he shows concern for the protagonist. He is knowledgeable about occultism and Kureha is his acquaintance. He and Sena are childhood friends and best friends.

Urban Legend "Mary of Happiness":
Doesn't the name "Mary" kinda give off scary vibes?
The one that suddenly calls and says "I'm Mary and I'm behind you right now."
But, apparently Mary from Narumigahama delivers the words of the dead people through his phone.
So, it is said that what Mary of Happiness delivers is a message from someone important to you who has passed away.

Spoiler

His full name is Kouyou Akizuki.