Kefir

The Laughing Salesman – Season 2

Scriptwriter, Nashiya Sutami, is addicted to energy drinks and Moguro offers him Kefir instead, but he must care for the culture and keep it alive. Sutami's health improves, but he develops a writer's block. He blames the kefir and destroys it. Before he can apologize, the kefir consumes him.