twenty-first day of the month

polyandry (plurality of husbands at the same time)

first discoverer (used especially in reference to the discovery of a dead body)

the Tokyo metropolitan region; the area surrounding and including the capital of Japan in Eastern Tokyo

(idiomatic) A traditional Japanese meal, consisting of a bowl of soup and three side dishes (rice, pickles, etc.).

(zoology) polyandry

the best or top person, such as the best performer in a company, or a leading expert

three days ago

World War I

the famous of the “one hundred poems by one hundred poets” anthologies, compiled by Fujiwara no Teika in c. 1235, used in the basis of certain card games