Is there anyone know how to skip blue crystal because I see it got a bug
This is a bug in the 1.00 version of the game. The blue crystal is automatically given to you as the slime that was supposed to drop the blue crystal later into the slime subjugation quest was bugged. However, the developer did not make the autorun
stop running the command, so you're stuck in an infinite loop of the developer apologizing and giving you blue crystals forever and ever.
I can't fix it because I don't have a way to modify this behavior. Maybe someone with wolf's editor can.
EDIT: I've obtained the wolf rpg editor and made a change so that it now only activates once every time you enter the map. Still can't make it stop, but it's a start.