About grind:
obtain lvl1 friendship with character. Then open save file with
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for example, modify Variable#341. Set it 60 or something like that. Its a modifier in conversation that add points to a reasult. so it would be something like that after any conversation:
you may modfy other vaariables that would add stars, but i wouldnt suggest to do so, its` possible that obtaining stars maybe trigerring something.
Thank you for the tip/cheats. Hopefully someone else may benefit from them, as I have long since uninstalled this game.
About energy:
Modify Variable#321. Make this variable the same number as you need to lvl. So in game, in character tab you would see (for example) 45/45.
After that click Level up. Experience won`t disappear, so you may level up as much as you want.