After Traveling Through the Iron Collapse, I Turned into a Black Saber?

Beng Tie+Doujin+Fate+Beng San "It mainly focuses on the plot. There are relatively few scenes where the protagonist fights, and it is more daily life." At the beginning, I was walking in the alley after get off work to withdraw money and was robbed by a thief. Finally blocked the thief in a narrow alley The thief took out a knife and threatened not to come near, but when I stepped back, I happened to step on a banana peel, and I suddenly jumped forward, with the blade piercing my body. Seeing what happened suddenly, he uttered a curse word in a low voice in shock, and his vision went dark and he completely lost consciousness. When I woke up, I found myself in the world of Bengtie