Ranma 1/2 (2-in-1 Edition), Volume 17: Boys Will Be Boys (Ranma Vol. 33-34 #345-366)

Ryoga and Ranma will stay forever young unless they eat a special mushroom at just the right time. But will they survive their squabbling over not wanting to share, or are they two shiitakes out of luck? Then, Akane’s got a secret - a brand-new and bigger bra, waiting to be tried on. But when Ranma suggests that Akane’s chest size may be shrinking, Akane goes from upset to enraged, and the arrival of Ranma’s mother, Nodoka, only adds fuel to the developing battle of the busts, and bust-ups.