Kei Yuuki

As a freshman and long-time childhood friend of Sawaki, this young man shares a deep-rooted connection to his classmate's family. Growing up alongside Sawaki, his life is closely intertwined with the local brewing industry, as his parents manage a traditional sake brewery. Because of this family business, his parents serve as regular customers for the specialized mold starter produced by Sawaki’s parents, creating a unique bond between their two households.