Kyon-Kyon, a jiangshi from Hell China, strives to regain her lost humanity by performing good deeds in the human world. Standing 148 cm tall with blue hair and yellow eyes, her petite frame contrasts sharply with her immense physical strength. She lacks pointed ears, a remnant of her original human form. Kyon-Kyon and her twin sister, Ran-Ran, were human villagers who died in war and transformed into aggressive jiangshi, losing their emotions. Subdued by a demon known as "Master," they trained under her to regain human consciousness and empathy.

Kyon-Kyon speaks with a distinctive "yo" ending and maintains a gentle, earnest personality, deeply committed to helping others as her path back to humanity. However, she exhibits extreme violence if provoked, especially if Ran-Ran is threatened or insulted. She cannot understand jokes or sarcasm, leading to confusion. Her abilities include fighting on par with powerful entities like Minos. Though she moves freely, her body is fragile, breaking apart easily upon impact and requiring adhesive reassembly. She remains vulnerable to glutinous rice, a weakness her master never addressed.

Kyon-Kyon shares a close bond with Ran-Ran, who appears as a panda and often intervenes to stop her violent outbursts. She develops a friendly rapport with Jashin-chan, affectionately calling her a fellow "dumb demon." Yurine Hanazono helps her secure a part-time job at Dragon Books bookstore in Jinbocho, aiding her integration into human society.

Her story involves daily efforts to assist humans, such as defending a child from thieves—an act that nearly turned lethal until Ran-Ran intervened. During Halloween, she attacked a rude boy, requiring Ran-Ran's intervention again. She openly discusses her tragic past with others, expressing sincere love for humanity despite her suffering, highlighting her ongoing struggle to balance her gentle nature with supernatural ferocity.