Brian Jay, a NASA astronaut, formed the renowned Jay brothers duo with his older sibling Eddie during his service. As a respected veteran, he mentored younger astronauts including Hibito Nanba, selecting him as backup crew for a lunar mission. Brian urged Hibito to embrace the challenge, advising him to "experience this tough and fun chance to your heart's content." His practical guidance involved identifying flaws in outdated training manuals and demonstrating expert multitasking.

He left a personal memento on the moon: an astronaut figure containing a childhood photograph of himself and Eddie. This symbolized his hope for the Jay brothers to stand together on the lunar surface and foreshadowed his aspiration for Hibito and Mutta Nanba to achieve a similar dream.

Brian died alongside two fellow astronauts in the CES-43 accident. This tragedy prompted NASA to reevaluate manned missions and profoundly impacted Hibito, who grappled with grief and feelings of inadequacy. Brian faced his final moments with dignity, embodying the inherent risks of space exploration.

NASA honored his legacy by naming an autonomous oxygen-producing rescue drone "Brian 03." This drone later saved Hibito during a lunar oxygen-depletion crisis, symbolizing Brian's enduring protective role. Colleagues recalled his subtly transformative influence on their careers and perspectives regarding space exploration, while his bond with Eddie served as a narrative parallel to the Nanba brothers' aspirations.