Tatsuyoshi, a 14-year-old student leading the tight-knit Destiny Squad, forges bonds with the protagonist and her friends through shared endeavors like constructing a creek dam to safeguard a goldfish—an act embodying their collective hopes and unspoken unity. His life fractures under familial strife when his father, a police officer, drowns in guilt after gambling away a neighbor’s savings alongside a woman, culminating in his suicide. The aftermath leaves Tatsuyoshi adrift in unresolved anger and sorrow.

Driven by fury, he and the protagonist embark on a midnight journey to confront the woman entangled in his father’s downfall. Cloaked in vengeance, he falters upon witnessing her shattered demeanor, her grief mirroring his own. Overwhelmed by memories of his father’s failures, he collapses into tears, the encounter stripping him of retaliation’s illusion. This raw clash with despair steels his resolve to abandon the village, vowing to one day break the cycle of broken trust by becoming a nurturing parent.

Within the group, he balances protectiveness with fragile vulnerability, his once-childish worldview crumbling under adulthood’s harsh truths. His departure becomes a silent testament to resilience, marking both an end and a reluctant step toward healing—a poignant echo of maturity forged not through triumph, but through navigating loss’s relentless tide.