- Voice Actor (CV)
- Yuuichi Nakamura
- Gender
- Male
- Age
- 15-21
- Birthday
- April 24
- Role
- Protagonist
- Identity
- A student enrolled at the National Magic University Affiliated First High School, operating covertly as a Special Lieutenant of the 101st Brigade under the alias 'Ooguro Ryuuya.' He simultaneously serves as a direct descendant and Guardian of the Yotsuba Clan, holds the rank of Strategic-Class Magician, and is celebrated in engineering circles as the prodigious artificer known as 'Taurus Silver.'
Personality
Unshakeable Composure
Devoted Sister-Complex
Emotional Numbness
Logic-Driven
Ruthless Decisiveness
Tatsuya stands as the central protagonist of the series. Despite being labeled a 'Weed'—a second-course student—upon enrollment due to poor practical magic scores, this designation is merely a facade concealing his extraordinary true capabilities. Born into the prestigious Yotsuba Clan, he was secretly groomed as a Strategic-Class Magician and operates across multiple covert roles as both a military officer and a legendary engineer. The aftermath of inhumane magical experiments conducted during his childhood has stripped away most of his emotional capacity, leaving him perpetually calm and analytical. Yet a singular exception exists: his younger sister Miyuki, for whom he harbors an almost obsessive protective instinct and the only genuine emotional responses he can still feel.