Nagisa Sakuraba serves as Koutaro’s stepsister and co-manager of Sakura Market, the grocery store inherited from their deceased father. Alongside her mother, she navigates the store’s daily operations, balancing external pressures from corporate rivals and simmering familial disputes. Her interactions with Koutaro reveal a strained rapport, complicated by his unwelcome attentions toward her physical maturity, which she rebuffs as inappropriate. Nagisa’s commitment to preserving the store’s legacy anchors her involvement in thwarting takeover schemes led by Koutaro’s estranged brother, reinforcing her role as a steadfast figure within the family’s struggle for autonomy. Her narrative remains tightly interwoven with these professional and personal conflicts, as documented media confines her arc to the store’s survival and her contentious yet essential bond with Koutaro.