Originally Posted by JessMini

Now I now why I'm always broke in this game. x) What do you do with your 1* manyus though? Assuming you don't have any girls less than lv30.. do you just sell them?

-Save them for low level girls (after evolving a girl, her level drops back down to 1, though she hardly looses any of her stats)
-Use them to "top off" a girl you're leveling up. I won't use just 4 lvl 5 manyu's on a lvl 40 girl, but I might use them in combination with several higher level manyu's.

Also, try using as many Manyu's at once as possible.
If three Manyu's raise your characters level by 3, then use them all at once, instead of three times just one Manyu. The cost of using a manyu goes up with every level, however, all manyu's used while a girl is at a certain level cost the same, no matter how many levels the manyus would give. 300 gold for 3 manyus at once is cheaper than 100 gold + 150 gold + 200 gold for those same three manyu's used in a row.