Kin's mysteries

Kin, his brother and his mother live in a small town, running the shop his dad left behind. Even if he's not happy with his life there, he is forced to stay and help his family.
One night he overhears an ambiguous conversation between a man and his brother. When he thinks about it the next day, he has a bad feeling. He begins to be tormented by the thought of that night, so he decides to investigate about that secret his brother holds, but he won't be the only one to try solve the mystery...