Stop!! Hibari-kun! S01 E13 Hibari Enters the Big Game!!

Ibari is hosting the annual gambling tournament for every yakuza boss in Japan. Hibari hog ties Seiji and takes his place wearing a traditional yukata. Yakkun, the idiot son of the boss of the Crazy Group, falls in love with Hibari. Boss Crazy demands Hibari marry Yakkun or he will destroy her family.