1520 (十五二十)
 

This is a manga that I saw in visibletime but I did not have any pictures so I looked for it.

Royal maid Ana and young prince Zelos have been bound together by a magical curse. The two 15-year olds are now each only 10 years of age. Each retains the ability to transform back to their original age with laughter, but at the cost of knocking the other down to a mere 5 years old! They wear clothes that fit at different ages. The age-shifting pair must search for a way to break the curse while trying to avert the disaster facing their two kingdoms.

http://www.mh160.com/kanmanhua/6511/

http://www.omanhua.com/comic/4102/

Re: 1520 (十五二十)
 

That looks really cute. I can't wait for some kind of translation.