[Crossover] The Chinese Girl of Ikebukuro

This is the story of a girl from Country Z who travels to Japan to find her father, goes through countless hardships and romantic entanglements, and finally finds her trashy dad with a thing for little girls. It could also be called The King of Fifty-Fifty, The Stronger You Are, the Stronger I Am, A Guaranteed Draw, The Legend of Ikebukuro's Delivery Girl, and plenty of other names that take things to the extreme. What kind of mysterious delivery girl has made a name for herself in Ikebukuro, traveling between Yokohama and Tokyo?! The heroine has some shortcomings in both EQ and IQ, but that doesn't stop her from being incredibly strong. Whoever she meets, she's always evenly matched. Whoever she meets. Emphasis on whoever.