Yoghina Yokono competes as a professional volleyball player for the Seven Fighters, becoming teammates with Mila Hazuki upon Mila's arrival. Her robust physical build defines her role as a formidable middle blocker on the court.

Her journey includes a phase of demoralization triggered by physical discomfort—specifically, side pain—and a crisis of confidence stemming from her belief that she lost her coach's trust during her involvement with the Japanese national team framework.

Yoghina later earns selection for Japan's National B team alongside Mila, Nami Hayase, and others. Within this squad, she initially clashes with Tulia Kaido, whose aggressive demeanor disrupts team cohesion. This rivalry evolves into mutual respect after Tulia transfers to National A and Yoghina contributes to National B's success in preparatory matches.

She has a sister, Nabiki Yokono—nicknamed "Moby Dicki"—who also plays volleyball and secures a spot on Japan's National A team.

Yoghina's trajectory shows her growth from a self-doubting teammate to an essential national squad member, navigating interpersonal friction while elevating her team's performance.