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The [page on Kuriyama Mirai on Kyoukai no Kanata
Wiki](http://kyoukainokanata.wikia.com/wiki/Mirai_Kuriyama#Appearance) says
she uses her ring to activate her ability.  
From the show, I got the feeling the ring was something that kept some of her
powers on check, rather than an activator.  
I don't recall any explanation of how the ring works during the series.

Whichever the case may be, how exactly does the ring help her control/activate
her ability?  
Does the ring possess some kind of magic? Or is it some kind of psychological
power it exerts over Mirai?


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question
beyond-the-boundary
How does Mirai's ring help her control her ability?


This answer only applies to the TV series proper. Additional information is
given in _Mirai-hen_ ; see Amir's answer.

* * *

There isn't really much to be said about the exact function of her ring. It
isn't discussed in the novel (though she is shown wearing the ring, [cf.
p004-005 of LN 1](https://i.stack.imgur.com/MEzRh.jpg)), so the best I have as
far as a textual citation is [this magazine
scan](https://yande.re/post/show/264440) (SFW image; NSFW site), which reads:

> 自分の血を剣に変えて戦う未来。普段は包帯と小指の指輪でその能力を抑えている  
>  [...] For the most part, she wears a bandage as well as a ring on her
> little finger in order to keep her powers in check.

There isn't really any verbalized explanation of how the ring works in the
show either - the best we can do is infer its function from its depiction in
the show.

So, basically, it's probably just what you thought it was - a power limiter of
sorts.


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From the events in the anime, it can be inferred that the ring is in fact an
object to keep her powers in check. The ring was a gift from the family that
took her in, and she accidentally killed one of the daughters in said family.
The ring serves as a reminder just how dangerous her abilities can be, and the
mistake she had made. In the anime, Mirai's blood becomes more acidic whenever
the ring is taken off. This can be seen when she gets into more serious
fights. So, technically speaking, the ring helps her keep that acidity away
from hurting her friends because she is reminded of what she did to the
family.


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This is a late answer, but in the sequel movie "Mirai-hen" it was revealed
that Akihito's mother made the ring from Mirai's mother's body after Mirai's
mother died. Mirai's mother said she would supress Mirai's powers and protect
everything that she held dear.


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