In this eposode,two teams competed in the pachinko at "Tengai Yojiro" in Kagoshima city.
Haruka and Yuumi made a team and two guys did and girls team lose this game.
So they two got punished by winner.
Before this penalty game,they are presented with the option of being spanked by left-handed or right-handed swing because he said he is a Switch hitter.
I do know the reason,but they took left-handed swing.