Ryou Matsumoto is a young, perpetually struggling screenplay writer whose scripts never secure production approvals. His professional disappointments drive him to frequent bars, where a drunken chance encounter changes everything: he witnesses a murder and becomes a target for organized criminals running an illegal antique smuggling ring. This violent incident forcibly plunges him into a dangerous criminal underworld.

Initially unprepared for real violence, Matsumoto gradually adapts by consciously adopting the fictional "action hero" personas from his own rejected screenplays. This deliberate self-reinvention helps him navigate escalating threats, including direct confrontations with skilled adversaries. He leverages his creative writing techniques—narrative logic, improvisation, and thematic tropes—to anticipate and counter criminal tactics, even emulating scripted martial arts sequences in a life-or-death fight.

His involvement deepens when he meets Yuki Tamura, a graduate student independently investigating her mentor's connection to the smuggling operation. Their shared danger forges a collaborative partnership, merging Matsumoto's imaginative strategies with Tamura's analytical resolve. They receive intermittent aid from Detective Mochizuki, a rogue investigator skeptical of official police methods. Their dynamic highlights Matsumoto's civilian perspective against professional law enforcement.

Throughout the conflict, Matsumoto's reliance on cinematic conventions evolves from a survival tactic into genuine courage. His understanding of "fiction versus reality" shifts as he experiences firsthand how real-world crises embrace coincidences and chaotic stakes that screenwriting rules would deem implausible. The resolution sees him survive through tenacity and applied creativity, while his future as a professional writer remains open.