[TrueAlchemist]

Originally Posted by Crazy Frog

Spoiler:

Also Mitsuya Shiina guardian is from Erika dojo

Spoiler for Spoiler:

Mitsuya Shiina does not have a guardian.
Better yet, 'guardian' isn't right word and it may cause a confusion.
In the book, it is 'body guard'.

The boy's name is Yaguruma Saburo.
Yaguruma family is employed by Mitsuya family.
So, the entire Yaguruma family works as security (body guard) and house keepers & workers. Before entering high school, Saburo was scheduled to be Shiina's body guard, but it was canceled because Saburo's magic was not improving. Saburo's family is not suitable for modern magic. Saburo has two siblings: one brother and one sister. Both of them did not enter the magic high school, and they are being trained by their grand parents at the 3rd research institute. According to the book, Yaguruma family is using a small space at 3rd research institute.

But, Saburo enters 1st high because he wants to protect Shiina. However, Saburo lacks talents to be neither traditional magician nor modern magician.
His parents tried to stop him, but he enters 1st high for Shiina. Everyone from Yaguruma family and Mitsuya family knows about it.