Movie
Description
Mutta Nanba was born on October 28, 1993, coinciding with Japan's loss in a Football World Cup qualifier, an event he links to a perceived streak of bad luck. A childhood fascination with space began for Mutta and his younger brother Hibito after witnessing an unidentified flying object on July 9, 2006. During this encounter, Hibito declared his intention to become an astronaut and travel to the moon, while Mutta, driven by competitive pride as the older brother, promised to aim for Mars. Over time, Mutta suppressed then seemingly forgot this dream.

As an adult, Mutta worked as an automotive engineer until he was fired for physically confronting his boss over insults directed at Hibito's accomplishments. Unemployed and living with his parents, his mother submitted his resume to JAXA without his knowledge. Hibito later encouraged him to reclaim his childhood dream, prompting Mutta to participate in JAXA's astronaut selection.

Mutta is physically distinguished by his distinctive afro hairstyle, a trait noted since childhood when peers nicknamed him "Afro." Attempts to alter his hairstyle to impress fellow astronaut candidate Itou Serika, whom he develops feelings for, prove unsuccessful. He typically wears a white shirt, dark grey pants, red tie, and brown overcoat.

Mutta's personality blends analytical thinking with self-deprecation. He demonstrates strong observational skills and creative problem-solving, evident during JAXA's third examination when he accurately calculated time in a sealed environment by recalling a bus clock. Despite considering himself unlucky and prone to mishaps, he perseveres through challenges using his engineering background and unconventional approaches. He values fairness and teamwork, proposing games like rock-paper-scissors to resolve conflicts among candidates.

His competitive nature surfaces primarily in his relationship with Hibito, driving him to outperform his brother. This rivalry coexists with deep mutual support and protectiveness. Beyond family, Mutta forms significant bonds with fellow astronaut candidates like close friend Kenji Makabe and maintains a lifelong mentorship with astronomer Sharon Kaneko, who nurtured the brothers' childhood interest in space.

Across adaptations, Mutta's journey remains consistent. The live-action film depicts his initial career struggles and entry into JAXA. The anime prequel *Space Brothers #0* explores his early experiences in the astronaut program. The manga continues his progression through advanced training, lunar mission preparations, and eventual arrival on the moon, fulfilling his childhood promise alongside Hibito. All media emphasize his resilience, intellectual growth, and the reconciliation of sibling dynamics with shared ambitions.