Asa Takii was born in Hiroshima City, Hiroshima Prefecture, Japan on 28 April 1884.
On 6 August 1945, at the age of 61, Takii survived the atomic bomb dropped on Hiroshima City. She said that she was washing clothes when she saw a huge flash. The blast killed her husband and family, and buried her in the rubble of her home until she was found days later.
Takii loved poetry and regularly wrote haiku, a traditional Japanese form of poetry, until giving up at the age of 106. Following the death of 109-year-old Tsuma Yasuda on 21 December 1992, she became the oldest living person in Hiroshima Prefecture.
Asa Takii died of heart complications from high blood pressure in Kurahashi (on the island of Kurahashi; now in the city of Kure), Hiroshima Prefecture, Japan on 31 July 1998. She was aged 114 years, 94 days. After her death, Tase Matsunaga became the oldest living person in Japan.