Motoharu’s older sister, known universally as Mino, navigates her third year at Sanada West High School, her true name shrouded in mystery even among close companions. Her childhood was marked by inventive yet merciless teasing of her brother, notably spinning him wildly by his arms along riverbanks—a memory he later cringes to recall. Now, with parents often absent, she assumes responsibility for cooking Motoharu’s dinners, though their bond remains a tempest of squabbles and quiet care. She idly permits her friends to taunt him, oscillating between protector and provocateur. Secretly resentful of Motoharu’s culinary prowess, Mino covertly spices his dishes to chaotic extremes, only for him to salvage each meal with practiced ease. Her petite frame, draped in Sanada West’s uniform—a crisp white sailor top with a blue collar, red neckerchief, and navy skirt—often leads to mistaken identity, her long black hair mirroring another’s silhouette from behind. A light-purple jacket occasionally layers her look. Mino orbits a tight-knit circle: Yoshitake’s sister, Tadakuni’s sister, and West High peers who join her in ribbing Motoharu. She boasts of their sibling harmony yet fuels gossip about him, blurring the line between affection and rivalry. Across adaptations, her narrative stays anchored to these dynamics—culinary clashes, sibling friction, and social mischief—culminating in a 28th-place series popularity ranking with 307 votes.