HOTD was an anime and manga during the popularity peak of the zombie genre; almost hentai, with zombies here and there.

The series is famous for ONE scene. The bullet dodging boobs scene.
This one.

So.
At what speed are those boobs bouncing?
AND THAT SOUND THEY PRODUCE

A rifle usually fires a bullet around 3000 feet~ per second, making it roughly around 2000 miles per hour.

That's match 2.5.
Taking in consideration the image, and where it fires. The bullet never loses momentum or speed.

There's around 30 feet between the rifle and the boobs

The boobs however, have no trouble to avoid the bullet, making it so to go faster than match 2.5.

The boobs are then moving around 5-6x times faster than a jet fighter, around 60x faster than a sports car at maximun capacity

So, how they can be this fast?

Well, let's take a look at the character.
According to her wiki, she is around 180 cm tall.

So, knowing this, we can aprox. the size of her boobs to around 40 cms tall and like 3-4 kgs each.

So flopping around, this girl reaches around one million Gs per boob. This will of course not only obliterate her but causing permanent ear damage of those in the radius of the explosion.

Knowing that her boobs are around 8500 flops per second, you can translate that to a TONE