Bakuetsu! Chimou Yuugi "Kakutou Shimai Monmon Hen"

The protagonist's dream of running his own dojo crumbles. Seeking a new path, he challenges his sister at her dojo, only to collapse from exhaustion. After being revived with a meal, the rematch ends in a draw with some unexpected support. To settle the score, they agree to reopen the dojo together. But the girls, wary of his potential, craft daily special training sessions to keep him in check.