C396 mustard seed bag

Sumeru Sumeru, Mustard Sumeru, Mustard Sumeru.

Since this was how the virtual boundary came about, it became the true realm. There was another thing called "mustard seed bag".

mustard seed bag, hide a small area of space inside a bag and use all sorts of methods to stabilize yourself.

With regards to the production method of mustard seed bag, although it was lost to others