You can fiddle with your save file easily, it's made for that. It's located here: 
C:\Users\YOURUSERNAME\AppData\Local\Magical_Monstergirls_Academy

Cheat codes

Go in the classroom and input the following codes (there is no UI, you will here a moan if the code worked). Arrows work instead of WASD. For mobile, swipe the screen (W = up, A = left, S = down, D = right)

    WWSSA to gain Lewd Arcana

    ASSWW to gain lewd blooms

    DADDD to unlock all the combat gallery

    DSASS to unlock all items

    ASDWW to upgrade all currently unlocked items