Collapse Starting from the Second Dimension

Coach, I want to go to the toilet.... Why did I get transported through time when I went to the toilet? ? And what the hell is this light ball claiming to be a system? My mother told me to believe in science, but when I saw the dragon-slaying sword in my hand, I fell silent... ┻━┻╰‵□╯┻━┻ My first time writing a book Please give me some advice if something is wrong. ???_??? This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.