Aya's original line about strip boxing is making a pun on "Yakyuuken", the popular name for strip rock-paper-scissors, sounding a lot like "Akyuuken" (Akyuu Fist). The gallery title wasn't translated by me, by the way, but at the time of writing I haven't come up with an equivalent pun either.
AND THAT'S FINE WITH YOU!?*STEP**STEP*Oh! It looks like Ichirin's going in for seconds!Akyuu-chan!
You can do it!Yeah! Yeah!
Do it, missy!......No...I don't want to lose like this...
With such humiliation...Will Akyuu be stripped naked just like that?*SHAKE*NGYAAAAA!*UOOOOO!*The winner taking things from the loser is perfectly in line with that...
Surely you've heard about strip poker, or strip rock-paper-scissors?
Call it strip boxing.Would you look at that! Ichirin strips off a piece of Akyuu's costuuuume!The crowd around the arena goes wiiild!*SHAKE*OH, SHUT IT!*SHAKE**SHAKE*Wait! That's...That's against the rules, isn't it!?Yeah, well, this is an underground boxing ring without any rules...
A truly no-holds-barred battlefield.You better show some fighting spirit.Otherwise I'll just take all of your clothes one by one.