Nanaka Takamori, the five-year-old daughter of Azu and Junpei Takamori, experiences her mother's daily care as Azu cycles her home on a backseat after work at her home-based nail salon. She radiates cheerfulness during interactions with her mother, especially during family routines like preparing for her father's return or sharing dinners.

Her world fractures following her father's affair revelation. The resulting family turmoil erodes her emotional well-being, manifesting as profound sadness and depression compounded by lost friendships from her parents' marital fallout. These experiences underscore the unintended consequences of adult conflicts on her young life.

In earlier, stable times, Nanaka engages warmly with her mother's friend Haruta Ryoma, showing clear affection and approval toward him. Throughout the narrative, her presence and reactions serve as an emotional mirror reflecting the family's fluctuating stability.