Hiroto Suzuki is a mysterious young boy with distinctive silver hair, appearing physically younger than protagonist Yōta Narukami. He wields exceptional technical skills as a hacking prodigy, employing specialized equipment like unique gloves and a hairclip to interface with electronic devices and networks, accessing and manipulating systems far beyond conventional means. Initially affiliated with a corporate entity led by the CEO and her assistant, Hiroto operates under Raita Oguma's supervision. His primary assignment involves investigating the origins and capabilities of a quantum neural control interface device possessed by Hina Sato, technology exceeding known human limits. This device, originally created by Hina's adoptive grandfather, manages her neurodegenerative condition and grants her a semblance of normal life, inadvertently providing predictive abilities perceived as omniscience.

During his investigation, Hiroto uncovers the device's true nature and the circumstances of Hina's condition. He realizes the CEO exploits him for corporate gain rather than legitimate scientific inquiry, prompting a significant shift in allegiance. Disillusioned, he defects to assist Hina directly. His technical knowledge becomes instrumental in thwarting the CEO's plans, especially when Hina is captured for surgical device removal. After Hina's surgery and institutionalization, Hiroto provides Yōta with critical information about her whereabouts and condition, enabling their reunion. He reveals that despite the device's removal, fragments of Hina's memories from her time with Yōta persist, suggesting residual neural connections or psychological imprinting. Hiroto's actions transition from serving corporate interests to facilitating the protagonists' efforts to protect Hina and preserve her autonomy.