First I looked up "Shiba Tatsuya" and found he was 18 years old. 18 + a half of 18 = 27. He was also born in 2079, which you can see is another 27. Finally, I looked at your username and it has a 27 to confirm my analysis.
The mahouka reference is correct while 27 is just my birthdate not age haha I appreciate your effort in analysing though :)))
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