| Hyakko takes place in the high school division of Kamizono Academy, a fictional gigantic private institution located in Kyushu, Japan, in which the motto is "to bring up talents of students in all departments and fields". Its storyline focuses on the comedic school life of the four main heroines, Torako Kageyama, Ayumi Nonomura, Tatsuki Iizuka, and Suzune Saotome. As the plot progresses, Torako and her friends gradually begin to learn and interact with their classmates in Class 1-6, in which each student has unique and extraordinary personality.
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| Torako Kageyama: Outgoing and usually the instigator of the pack, she is identifiable by the fact that she does not wear a blazer over her shirt and tie like most other characters. She's a typical trouble-maker, who likes to achieve her objectives in a straight-forward and intuitive manner and doesn't really seem to mind other people's circumstances. Because she was absent during the first few days of school, she was unwittingly assigned as a member of the discipline committee. She has an older brother Kitsune, whom she apparently holds in very low regard, and an older sister Oniyuri. It is later revealed that Torako is actually a half sister of Kitsune and Oniyuri. Torako used to live with her biological mother until she died of a disease when Torako was attending elementary school. She was then brought to her father's family by him, a decision to which Torako and her stepmother disapproved at first. Due to this reason, she does not have a good relationship with her current family. So much so that she runs away from her home whenever she has a quarrel with her family. However, Kitsune explains that it is always her half-sister Oniyuri's kindness that brings Torako back to the family. She's Suzume's childhood friend. Despite her tendency to skip classes, she still receives above average grades in tests as she is actually quite intelligent. She's 164 cm tall and her three sizes are 81-55-82. Her name contains a kanji of tiger and the first kanji letter of her name can be pronounced as 'Ue' (West), thus revealing her name's relationship with White Tiger of the West.
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| Tatsuki Iizuka: Daughter to the corporate president of E-lectra, one of the biggest electronics companies in Japan. She lives in a modest-looking house with a housemaid, separate from her parents due to her father's work. Ever the classy one, she tends to use honorific speech even towards her closest friends and is often annoyed by Torako's mischief. Nonetheless, she has the tendency of ending up being taken along, forcefully or otherwise, with the other main heroines over the resulting shenanigans. Her name contains a kanji of dragon and the first kanji letter of her name is pronounced as 'I' (East), thus revealing her name's relationship with Azure Dragon of the East.
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| Suzume Saotome: Suzume has been Torako's close friend since the middle school. She is usually very quiet but possesses monstrous strength and immense appetite. Despite her superior athletic ability, able to best her homeroom teacher in a one-on-one dodgeball match, she is in distress for looking child-like and not feminine enough. In fact, she does not wear a bra and does admire Tatsuki for wearing underwear�s for grown-ups. She also cannot swim. She seems to have no sense of shame and her behaviour is very unpredictable, which often throws her friends off balance. Whenever Torako runs away from her home, Suzume always accompanies her. Her name contains a kanji of sparrow and the first kanji letter of her name is pronounced as 'Sa' (South), thus revealing her name's relationship with Vermillion Bird of the South.
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| Ayumi Nonomura: Popular among boys for having a large bust and a naive personality, her photos are always in high demand. Due to her extreme shyness, she has had trouble making friends ever since the middle school and is most often the victim of practical jokes and mischief by others. Her three sizes are 90-56-85. Her name contains a kanji of snake and the first kanji letter of her name is pronounced as 'No' (North), thus revealing her name's relationship with Black Tortoise of the North.
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