Japan invaded Manchuria in 1931, which marked the beginning of its aggressive expansion in Asia prior to World War II.

The Taisho period, which lasted from 1912 to 1926, was marked by political instability and social change, including the rise of labor unions and women's rights movements.

Katsuobushi, a type of dried and smoked tuna that is often used to flavor dishes and is a key ingredient in dashi.