Hajime Himuro works as Dr. Kōsaku Tokita's assistant at the Institute for Psychiatric Research. He partnered directly with Tokita to develop the DC Mini—a device permitting users to enter and document others' dreams. Himuro's technical expertise proved essential to the invention, though Tokita retained lead inventor status. Outside the lab, Himuro maintained an unusual personal hobby: amassing and modifying dolls with mechanical components until his entire apartment overflowed with them. This preoccupation with artificial forms later echoes within his narrative trajectory. When multiple DC Mini prototypes vanish, Himuro surfaces as a theft suspect. Dr. Tokita spots him in the riotous dream parade invading Chief Shima's subconscious, implying complicity. Further scrutiny exposes Himuro's compromised physical state—reduced to a hollow vessel under external command. Dream evidence connects his manipulation to the Chairman and Dr. Morio Osanai, who exploited the stolen DC Minis to enslave his mind. His controlled condition advances the antagonists' goals, channeling their dream invasion operations. This subjugation cements his role as a passive instrument in their conspiracy, not a willing conspirator. Himuro's past harbors suppressed professional resentment toward Tokita, born from feeling perpetually eclipsed by Tokita's scientific brilliance. This friction imbues their partnership with psychological tension, though whether it influenced his actions before mental domination remains ambiguous.