I've finish the quest of the dragon

but somehow the sword gone,which i didnt find out at the beginning, at first I try to be in a battle with grantx, but my cost was zero and i cant fight him, and all option became bounce your pack, and i cant fight, if i click on one of the option, i cant even flee. I tried to start a new game and it went well, but the former save file is still in bug. I took a chance and look through the equipment, but my excalibur was gone, and if I took another weapon to fill its gap, problems solved, but I lost my op weapon forever. Meanwhiles, I cant fight the dragon on the dicktionary, though I have his two strip cards.

By the way, where can I find the scene  before the cg of grant's rags(the second last underwear) I cant find it on the ground