Does Shiba Tatsuya have two Magic Calculation Areas?


The Wikia page (as reliable as it can be) on Tatsuya says his original Magic
Calculation Area [is completely taken by his Decomposition and Regrowth
magic](http://mahouka-koukou-no-
rettousei.wikia.com/wiki/Shiba_Tatsuya#Innate_Magic).

> Tatsuya can only freely wield two types of active magic, based on his innate
> ability of directly interfering with structural information;
> **Decomposition** and **Regrowth**. [...]. Owing to this circumstance, his
> natural Magic Calculation Area is dominated by these two powerful abilities,
> making him unable to wield other magic.

It also says that the magical surgery performed by his mother [implanted
another Magic Calculation Area](http://mahouka-koukou-no-
rettousei.wikia.com/wiki/Shiba_Tatsuya#Systematic_Magic) in his limbic system
(part of the conscious mind).

> In order to allow him to use Systematic Magic, instead of merely his two
> natural "powers," his mother and her twin sister operated on Tatsuya when he
> was 6 years old, installing another Magic Calculation Area or Magic
> Processor (resulting in him having two) in his mind which allows him to use
> magic.

My question is, do the light novels really state that he has two Magic
Calculation Areas?




Yes he does, and yes it is - an experiment performed on the 6-year-old Tatsuya
replaced his emotions with another Magic Calculation Area, which means he has
two when combined with the one he was born with. This is confirmed in the
light novels:

While visiting FLT to deliver the newly developed flying magic, Tatsuya and
Miyuki run into their father, Shiba Tatsurou, and a butler, Aoki. After a
confrontation between Tatsuya and Aoki, a segment of writing briefly covers
the experiment that gave him his second calculation area:

> [Shiba Miya] used the forbidden Non-Systematic Magic 'Mental Design
> Interference', forcibly altering the area in the consciousness, most likely
> to create strong emotions called the limbic system by inputting a Magic
> Calculation Model, creating an artificial Magician. The one who designed
> this experiment was Yotsuba Maya [...] while the one who conducted this
> experiment on her six year old son that had no magic skills was Shiba Miya.
>
> _Volume 3 - Nine Schools Competition I, Chapter 2_

The detail on the experiment here is limited to this, and instead more
emphasis is put on the fact that the inclusion of an additional Magic
Calculation Area replaced his strong emotions:

> Tatsuya's heart did not possess the ability to "hate". He could not feel any
> strong emotions like fury, despair, envy, hatred, disgust, gluttony, lust,
> sloth, and...... love.
>
> _Volume 3 - Nine Schools Competition I, Chapter 2_

While this meeting at FLT is shown in episode 9 of the anime, it skimps on the
details on Tatsuya's background, and instead just focuses on the interactions
between the four people present.

* * *

Additionally, this is also covered in chapter 4 of the NSC arc manga (Mahouka
Koukou No Rettousei - Kyuukousenhen), where visual proof of a second Magic
Calculation Area is provided:

[Manga Page
http://2.p.mpcdn.net/25603/440080/32.jpg](http://2.p.mpcdn.net/25603/440080/32.jpg)

