Kei Yuuki
結城蛍
Kei is a childhood friend of Sawaki and, like him, a freshman. His parents run a sake brewery (making them customers for the mold starter from Sawaki's parents).
結城蛍
Kei is a childhood friend of Sawaki and, like him, a freshman. His parents run a sake brewery (making them customers for the mold starter from Sawaki's parents).
