Cool... and amusing. The only problem is that drinking Jyusenkyou water
doesn't do a thing to you. ^_^

Says who? I don't remember reading anything about this in the manga before.

Says Takahashi-sensei. It's in the final manga. Happousai drinks the man
drowned water and doesn't change into a young man. (And age does count
in the Jyusenkyou water curse or else you wouldn't have 'Spring of Drowned
Child')

Kun-chan...