Why is Seigi's tattoo described as "triggerless"?


On multiple occasions, Seigi's tattoo is described as "triggerless" (this is
the wording used on Crunchyroll). The first time we hear this is near the end
of episode 1, around 22:08. However, when Seigi is talking with Izzy and Tom
on the school roof in episode 2, Izzy tells him that his tattoo is triggered
by blood.

It hardly makes sense for a "triggerless" tattoo to have a trigger. What's the
deal?

(At first glance, this seems like a translation mishap, since the Japanese
word in question is _mugen_ , and I don't know of any way to get from there to
"triggerless". But perhaps there's a good reason for this - I've only seen 3
episodes of the anime to this point, so I'm not very knowledgable about _Taboo
Tattoo_.)




The manga refers to it as 無鍵 or "keyless." The anime [uses the same
term](http://www.tv-tokyo.co.jp/anime/tabootattoo/episodes/) (see the Ep. 3
summary).

As for what these keys refer to,

> There are actually 4 Void Makers and they are the keys to the Tattoo Ruins.
> It seems that every Void Maker needs a host to become a "key." So apparently
> Seigi's Void Maker had no compatible host prior to him, thus making it
> "keyless."

His trigger however seems to be blood.




The manga refers to it as 無鍵 or "keyless." The anime [uses the same
term](http://www.tv-tokyo.co.jp/anime/tabootattoo/episodes/) (see the Ep. 3
summary).

As for what these keys refer to,

> There are actually 4 Void Makers and they are the keys to the Tattoo Ruins.
> It seems that every Void Maker needs a host to become a "key." So apparently
> Seigi's Void Maker had no compatible host prior to him, thus making it
> "keyless."

His trigger however seems to be blood.

