Originally Posted by
Myrdin
Yes... yes you can do that. And not only that.
The Crafting is not exactly deep atm, but recently they added some more stuff that allows you to evolve personal equipment (each girl has a 5th equip slot for a unique item only she can use) to be evolved same like you evolve girls. So they are certainly improving the mechanic step by step.
ATM you can upgrade 3 lvl5 manyu into 1 lvl20 manyu (saving space while maintaining the efficiency anyone?). Or you can upgrade your low tier equip seed for mid grade, and mid grade for high grade (yes a new line of items has been introduced.)