where is mana stored in mushoku tensei

In Mushoku Tensei, mana is generally stored inside the body as a natural energy reserve, often described as circulating through a person like blood and existing as a kind of internal pool.

Quick answer

• Every living being in the Six-Faced World has mana within their body.

• Magic works by manipulating that stored mana to cast spells.

• A person’s mana amount is usually described as their mana pool or capacity, meaning how much they can hold and use.

Extra detail

For normal humans and other living creatures, the series treats mana as something naturally present in the body rather than in a single visible organ.

Some explanations compare it to a reservoir or circulation system, with mana flowing internally and being spent or replenished over time.

Small caveat

The series also implies some special cases, like beings who cannot retain mana normally, so their bodies react badly as mana accumulates externally.

So the simplest answer is: mana is stored within the body , as an internal mana reserve.

TL;DR: mana is stored in the body as an internal mana pool, not in one specific organ.