Go downstairs, leave the house. Go down and enter the school. Talk to Gino (and to others if you like). Go left. Then go left 3 times, up 3 times. Left and enter the castle. Go downstairs, left, you can attack them with your magic. Go left, read the message, go all the way back and leave the castle. It'll blow and kill the girl with your magic too. You've won this D-Mod!