Issei Minagi, biological father to Koharu and stepfather to Hiyori following his marriage to Hinata, navigates parenthood shaped by tragedy. The loss of his first wife Yuuko and son Natsuki in a traffic accident forced him to balance single fatherhood with relentless work hours, fostering an overprotective streak that surfaces as anxiety over his daughters’ safety during activities like camping.

Beneath his gentle demeanor lies emotional fragility, evident when exclusion stings during his daughters’ bonding moments or when Hinata allies with them in disputes. Though culinary skills elude him, he cherishes café outings with Koharu—a ritual born from their years alone. Post-remarriage, the family’s reliance on Koharu’s cooking persists due to Hinata and Hiyori’s shared culinary shortcomings.

His growth emerges through hesitant steps toward trusting their autonomy. A turning point arrives when he resists their camping plans but relents after their earnest appeals, culminating in a heartfelt conversation where he acknowledges their maturity. This evolution peaks when Hiyori’s fleeting use of “Dad” etches itself into his heart, despite her hesitation to repeat it.

Ryouta Yoshinaga admires his dedication as a single parent, while his bond with Hinata weathers occasional estrangement, always mending through mutual effort. Quirks include eschewing a wedding ring, a family habit of dodging conflict, and playful threats to retreat to his childhood home when feeling overlooked.

Physically, he carries a calm presence with brown hair, golden eyes framed by glasses, and a soothing aura. His journey intertwines grief, adaptation, and the quiet strength of rebuilt family connections.