In Episode 5 of "Bartender - Kami no Glass," a group consisting of Ryu, Kyoko, Yuri, and Chen sets out for the Yamazaki Distillery, renowned for its significance in the world of malt whisky production. Early in the morning, the group gathers at the train station in the summer heat, where Kyoko expresses her excitement about visiting what she calls the "holy ground" of bartending. Upon arrival, Taizo, another member of the group, explains that he organized the visit due to the distillery's historical and educational value.

As the tour begins, Chen reveals a connection to his mentor Kuzuhara, which further deepens his interest in the distillery. During the tour, Ryu explains the whisky-making process from barley to maturation, emphasizing the dedication required for this craft. The group learns about the influence of the surrounding rivers and climate on the whisky's aging process, which contributes to the unique characteristics of Yamazaki whisky.

Kyoko and the others chat with the tour guide about the large barrels and their contents, leading to discussions about the history and craftsmanship involved. Chen remains reserved, hesitating to actively participate, and instead focuses on observing and learning quietly.

The episode also delves into personal stories: Chen recalls a previous Gion Festival that he couldn't attend due to obligations to his father. This memory leads to a poignant moment where Chen reflects on his life choices and the paths laid out by his parents, mirroring the themes of tradition and innovation in whisky-making.

By the end of the episode, Chen, moved by his experiences and conversations about time and maturation—both in whisky and in life—seems to have gained a deeper understanding of his profession and personal journey. The visit to the distillery serves as a metaphor for the maturation process of whisky, intertwined with personal growth and overcoming past regrets.