Yoshiaki, a stage magician with ochre hair and piercing green eyes, maintains a solemn demeanor, his focus sharpened by an unrelenting drive to uncover concealed realities. His singular obsession lies in tracking down his vanished older brother, Tsubasa—former leader of the Phantom Thieves—who disappeared following the cataclysmic event called the Lost. This quest compels him to ally with protagonists Takuya and Yuki, employing his sleight-of-hand precision and strategic intellect to breach high-security facilities like Lacuna Chemical Laboratory, where secrets tied to the disaster fester.

His past is marked by a fractured bond with Tsubasa, strained further when external manipulations warp his brother’s choices. Determined to reconcile, Yoshiaki clashes with Tsubasa over possession of Tsuki’s Tears and Hoshi’s Tears, mystical jewels linked to the Lost’s aftermath. These artifacts anchor the conspiracy he unravels, his analytical expertise proving vital in decoding their cryptic role within the larger scheme.

Initially a lone operator fixated on personal redemption, Yoshiaki gradually integrates into the group’s collective struggle, his calculated tactics and defiance of corrupt power structures bolstering their resistance against shadowy entities. His arc culminates in a reckoning with Tsubasa’s legacy and the ethical fallout of their fractured loyalty, pivoting his focus from solitary vengeance to exposing the truth—a shift that cements his place as both architect and ally in dismantling the lies shrouding the Lost.