Mochi Kosh is the wife of Hish Kosh and a professional tea brewer.
At some point in the early 2020s, Mochi married Hish.
In 2026, Mochi became the first female champion of the Okinawa Tea Brewing Championships, beating Mickey DeMarcus in the finals. She won again the following year.
The Black Box 3
Mochi is first seen at the dinner table with Hish, encouraging him to open up about his past trauma in the United States. She listens patiently as Hish unloads his past trauma and consoles him when he becomes too scared to share more (Chapter 2).
- Mochi is the first female champion of the Okinawa Tea Brewing Championships, winning in 2026 and 2027.