Though South Korea has a lower fertility rate, Japan's population is getting smaller at a faster rate. It was reported that 29 percent of Japan's population is 65 years of age and older.

"It's not falling gradually, it's heading straight down," said Mori, who currently advises Kishida on LGBTQ issues and the birthrate issue.

"A nosedive means children being born now will be thrown into a society that becomes distorted, shrinks and loses its ability to function."

Mori has acknowledged that the slide will be difficult to address, especially since the number of women within child-bearing age has declined. However, the Japanese government is doing what it can to help reduce the damage.

It is not yet known what is contained with Kishida's spending package, but critics have suggested that giving money to families with children is not enough. 

One government document from a panel suggested that Japan must reduce the burden on women to raise children, and providing them a way to participate in the workforce after giving birth, according to the report. 

Mori has criticized the tendency to reflect on the population issue independent of trade, finance, and female empowerment.

"Women's empowerment and birth rate policies are the same," she said.

"If you deal with these things separately, it won't be effective."