Before becoming Rentaro's girlfriend, Hahari tries forcing herself to think and act in a manner she believes to be pragmatic, deliberately suppressing her emotions so that they cannot influence her choices. In later appearances, her love for all things cute become increasingly more prevalent, often overwhelming her common sense and dictating her decision making to the point that it even influences her hiring criteria. She also has little sense of scale, and will use her vast fortune for comedically impulsive ends. She is as perverted as her daughter Hakari, although her desires are rooted in a love of playing "mother" to whoever could stand in the role of her child. Rentarou-chan, Please go out with me?!! When Hahari was in middle school, she fell in love with a terminally ill classmate. Out of love and a desire to preserve his memory, she arranged to be artificially inseminated with his genes and gave birth to Hakari at the age of 13. The trauma of losing her beloved left her unable to imagine finding love without him, and determined to protect Hakari from following in her footsteps.When Hahari finds out about her daughter's relationship with Aijo Rentaro and his four other girlfriends, she immediately assumes the worst, not realizing that all of them were Rentaro's fated soulmates and not believing that he genuinely loved all of them. She held Hakari prisoner inside the Hanazono estate while arranging to move her to a new school, and threatens to eliminate Rentaro if he continues to pursue her. When Rentaro and his girlfriends are undeterred and move to rescue Hakari regardless, Hahari confronts Rentaro after he and his second girlfriend Karane Inda are both apprehended by her personal guard. However, when she makes eye contact with Rentaro, it is revealed that she is his sixth fated soulmate, and she immediately falls in love with him. She is subsequently unable to deny his true love for Hakari, even with the use of a lie detection machine, and after he risks his life to save Hakari's own, she finally relents and gives Rentaro her blessing. To her surprise, Rentaro offers to take care of Hahari as her boyfriend as well, an offer Hahari graciously accepts. Not long after, she buys his high school and instates herself as chairwoman so she can spend more time with Rentaro and his harem.

Hahari is a very beautiful young woman whose features are similar to Hanazono Hakari as they both share the same pink hair that has flowery hair ornaments, green eyes and a voluptuous figure. However, the only difference is that Hahari has ankle-length hair that is split in the middle with bangs hanging on the right side and chest-length hair strands resting on either side while the tips of her hair are curled in a ringlet, and she has a mole under her left eye. She usually wears a white, low-cut, backless dress as her loungewear and lets her hair down at home.