This is Takara Tomy Demon Slayer Plush Nitotan Zenitsu.
It is an introduction of new products from the TV animation [Ohaki no Blade] which started broadcasting in April 2019.
A stuffed toy with a ball chain has appeared from the two-headed deformation series [Nitotan]!
It is a stuffed toy of the size which is easy to go out together.
Takara Tomy Demon Slayer Plush Nitotan Zenitsu (1 pc)