Gaku is a cat cafe employee who works alongside his sister, Kaoru, and Kunagi. He is usually the one who serves the food and drinks to the customer

Gaku has purple eyes and a short beard and wears white shirt with yellow cat apron and dark blue jeans.

He is a man who had a charismatic personality, who shows friendly attitude to the customer and sometimes give cat related advices alongside Kunagi and Kaoru when the time is right, stating that taking care of cats is not as easy as one may think.
However, he can be extremely angry if someone break a rule in the cafe, as shown when he knocks out Tanishi and angrily states that cologne is not allowed near cats.

During the initial nyandemic, he was one of the first victim of the nyandemic. Being infected by his cat who came into contact with the origin cat while attempting to evacuate everyone out of the cafe.
He attempted to slow down the cats to give everyone a time to escape while on the run with his remaining humanity once he starts showing physical signs, happily embracing what will become of him.

(Source: Nyaight of Living Cats EP1, EP2, EP3 and EP4)