Leo and Julius had a somewhat complicated relationship.
Although, at their core, the two were half-brothers, as everyone knew, in families like theirs, all kinds of problems could crop up even between twins, let alone half-brothers.
Not to mention that, from a certain point of view, Leo's very existence was meant to "replace" Julius.
Julius was called a "failure" because he wasn't a magus.
Before participating in the Holy Grail War, he was already barely alive. He'd undergone brain surgery that would affect the rest of his life, and had been organically connected to the Harvey family's supercomputer.
Because of that, from a certain point of view, Julius was almost like a half-artificial intelligence.
He'd originally been a "designer baby," eagerly anticipated as an heir to the Harvey family. But even before he was born, he'd been found to have poor abilities and serious defects.
The adults had decided he would "produce no benefits" and abandoned him. He'd survived through sheer force of will and climbed to his current position.
He was the captain of a private counterterrorism unit, an assassin who had secretly eliminated many hostile forces over the years.
At the age of six, drugs had been used to make his body grow into that of an adult, all so he could produce the "benefits" the adults wanted.
His value as a survivor had been recognized three years later. After completing his first job, he joined the assassination unit he belonged to now. The only time that counted as a childhood for him was the time he'd spent with Leo's mother.
Yes, Leo's mother.
His biological mother had already been disposed of.
Because she had given birth to a defective child like him.
And because of the warmth Leo's mother had given him,
his resolve to do everything