While it looks very ceremonial and fantastical; doesn't look like your conventional bardiche, the designer explicitly said that it is indeed a bardiche in the commentary.

Should it be tagged under bardiche_(weapon)?

The golden axe returns!

Too bad it's not just a plain golden hatchet.
Some people see glory in death.
But for suichan, it's just Tuesday.

I like how the artists use the word 'tailored' when commenting on the costumes they've designed.

What is the name of her axe?

akumaten said:

What is the name of her axe?

It's called a bardiche