Gin Itsutsubashi serves as a Kyoto Branch operative of the Shinkansen Ultra Evolution Institute, debuting in Episode 34 alongside his twin brother, Jō. The siblings mirror each other in personality, bonding over a fervent appreciation for wild-caught fish—a topic that sparks animated debates on culinary nuances. Their unorthodox, improvisational combat style once clashed with teammate Takatora Kirishima’s disciplined strategies, creating tensions that disrupted the Trinity Shinkalion fusion. Mediation later bridged their differences, enabling smoother collaboration in joint missions.

Gin pilots the compact yet agile Shinkalion 700 Hikari Rail Star, optimized for long-range engagements with rapid-fire artillery such as the Alarm Gun. Despite its smaller frame, the 700 Series matches larger units in combat efficiency, amplified by the twins’ seamless coordination. Their synchronized movements, speech patterns, and tactical adaptability solidify their reputation as a cohesive unit within the Institute.

Hailing from Yamaguchi Prefecture, the twins’ unspecified early life gives way to a narrative focused on their evolution from discord to synergy. Their journey underscores the importance of reconciling divergent approaches to harness their full potential in high-stakes Trinity operations, cementing their role as dependable partners in the Institute’s defense efforts.