Sazae-Oni is a giant turban snail demon.

This yokai shapeshifts into beautiful women and pretends to be drowning in the sea to lure seamen into rescuing her.

Sazae-Oni collects testicles, steals them from the unsuspecting men by bitting them off.

In some legends, they say that Sazae Oni uses the semen from the testicles to breed more Sazae Oni.They are often called the Succubus of the sea.