Shunsuke Otosaka, eldest brother to Yū and Ayumi Otosaka, wields the power of Time Leap—a rare ability allowing him to revisit and reshape past events. This gift comes at a cost: each leap erodes his vision, a cumulative toll that culminates in irreversible blindness. In youth, his vibrant blue hair and eyes marked him distinctly, but as age and relentless time manipulation took hold, his hair darkened to slate grey, his eyes fading to a pale, sightless hue. Now dependent on a white cane, he navigates a world growing perpetually dimmer.

Driven by a fierce resolve to shield those with extraordinary abilities from exploitation, Shunsuke founded a clandestine organization dedicated to their protection. Strategically deploying Time Leap to avert crises, he rewinds pivotal moments to disrupt the capture and abuse of ability users. Yet every intervention accelerates his descent into darkness, a sacrifice he accepts unflinchingly.

His relentless timeline alterations ripple outward, irrevocably reshaping lives and fates. Bound by duty, Shunsuke prioritizes others’ safety above his own, particularly for Yū and Ayumi, whose well-being anchors his every decision. His partnership with Kumagami forms the backbone of his mission, their collaboration forged in trust and shared purpose. Kumagami’s death leaves Shunsuke grief-stricken, a loss that deepens his resolve even as it fractures his spirit.

A figure of quiet responsibility and unyielding care, Shunsuke’s choices steer the course of events, balancing the weight of power against the price of protection. His journey underscores the duality of sacrifice and consequence, a testament to the burdens borne by those who dare to alter destiny.