[The Sky Is a Red River Bank] Sharp Sword

In this life, from death to life, from birth to death, she was a sharp sword in his hand. An idea that my deskmate and I discussed passionately every day in high school was that she got married this year. TT The sad thing is that I still can't write a long version of this idea, so I'll write a short story! Note: Yes, the protagonist's name is Marshmallow. This was the temporary name we decided on when we first discussed it, because we liked eating marshmallows very much at that time. Anyway, I can't think of a good name now, so I'll just call it marshmallow. No laughing, you hear me?