Ten years ago, on a training journey in the country with his
father, Ranma stole okonomiyaki (a cross between an omeletand a pancake) daily from Ukyou's father's yatai (food
cart), easily overcoming `Ucchan''s defense. However, it
was a friendly rivalry -- Ukyou drew pictures with
okonomiyaki sauce on them for Ranma.
Her father told Genma that Ukyou said she wants to be
Ranma's wife. Genma said Ranma already has a fiancee.
Ukyou's father said that's too bad, he was thinking of
giving them the yatai for a dowry. Genma said, "We'll take
her!"
In a quandary, Genma let Ranma make the decision-- he asked
Ranma which he liked better, okonomiyaki or Ukyou. Thinking
that Ukyou is a boy, Ranma chose okonomiyaki.
So Genma and Ranma ran off with the yatai and left Ukyou
behind.
Since then, Ukyou decided she will never
like boys again, dressed and lived as one, and
devoted herself to okonomiyaki style martial arts.
She shows up as a new student at Furinkan High and
challenges Ranma. After a heated battle, Ranma discovers
Ukyou's actual gender (and verifies it by pouring hot water
on her!). Meanwhile, Ukyou discovers that Ranma does not
get along with his "uncute" fiancee. Ranma and Ukyou
reconcile, and she becomes enamored of him again.
Though she still dreams of marrying Ranma, Ranma still
treats Ucchan only as an old friend. She plots to win him
over using a less violent and more psychological approach than Ranma's
other suitors , like arranging a date between her and
Ryouga.
Ukyou and Ryouga constantly scheme togehter so she could end up with
Ranma and he with Akane.