Ranma 1/2 2 in 1 Edition Volume 17 features story and art by Rumiko Takahashi. Includes Volumes 33 and 34.

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? Then, Akane's got a secret—a brand-new 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, as well as bust-ups.