After Hinako first joined a prestigious ladies-only school, the expected pressure for such institutions instantly fell upon young Hinako. Not only was she demanded good grades and exceptional behavior, she also had to be the first in her class in any sport. She was offered many different sports, but none of them raised Hinako's attention. That is, until she visisted a Sumo arena....

Once she saw a Sumo match, Hinako's world turned around completely. Sumo was an art in itself, much more than any other martial art. She realized that Sumo should not only be practiced by overwhelming men, but also normal women could be able to exceed themselves in the practice of this art. Hinako decided she would restore the grace and beauty that Sumo is supposed to represent.

Back in her school, Hinako wanted to join a Sumo club, but everybody just laughed at her, and deemed her as a crazy brat. Sumo was just out of the question for the refined and delicate ladies of her school. Hinako didn't bother to hear any reasons, as her mind was already decided. Everyday she practiced the arts of Sumo, and instead of gaining weight, she decided to train her arms and legs to be able to support the weight of any huge Sumo wrestler. After all, it wasn't the size that counted, but the refinement of the technique that mattered.

After a long period of training, Hinako has decided to prove her worth as a Sumo wrestler. After trying (and failing) to convince her school's superiors to show her fellow students the beauty of Sumo, she decides to go to a local martial arts tournament, and smash the tough-looking opponents with her Sumo style. Surprisingly, many martial artists were caught off-guard by the strength of this fragile woman. It was outrageous how a simple junior high school girl could practice Sumo so well! After the tournament finished, Hinako was content about her performance, as many men stare at her in awe. On her way out of the fighting arena, she is faced by a red-haired, ravaging woman called Mai Shiranui, and another younger, spunky girl named Yuri Sakazaki. The two consider Hinako worthy enough to join their team and participate in the next King of Fighters 2000 tournament. Hinako is overwhelmed: this time, she can really prove her true Sumo strength against the best fighters in the world!

During her vacation period of junior high school, Hinako decided to take a school trip back to the place where the whole nightmare had developed last year: Southtown. The city was still reduced to shambles, but people were trying their best to rebuild what was left of it. Hinako was proud and felt compassionate for those people who still struggled. She wished she could have done more for them back then.

Hinako and her schoolmates were starving after so much walking and sightseeing, so they decided to stop at a local establishment that was still standing (even though a bit wrecked). Hinako entered, and there she found her old friend Mai, along with King, who owned the bar. King was also a female warrior that entered the last King of Fighters tournament. The other girl was a young Chinese lady with a big forehead and strange hair style. Hinako wonders what's going on, and Mai tells her that the King of Fighters tournament is being held again. Hinako said she would be glad to join, and nobody seemed to have a problem with that. But first, she and her friends needed a meal, and King was forced to offer all her fleet a nice dinner! Hinako also didn't seem to carry too much money with her...in fact, after the tournament ended, and the four women went for a celebration dinner honoring the fall of NESTS, everyone expected Hinako to pay the bill (since she came from a prestigious family) and fed their hearts off, only to realize with grief that Hinako no longer had any money! We'll see if Hinako can make up to it next time....

Hinako, despite being of a rich family and in a top-class ladies school, is not spoiled by money or social class. She has lots of dreams which she hopes to accomplish some day. She is very feminine despite the masculine art she practices. Despite getting down and rough with her opponents, she takes care of her personal appearance a lot. She defends the opinion that anything can be done with grace and style if done correctly!