Twin siblings who are called by the mysterious author of the book. This author asks for a favor of saving the book's Main Character and made a vow with them. What they didn't know was this vow is the switch of their deaths. "Lupe! Lipe!" "What is happening?" He asked as he tightly grabbed his chest. He can't breathe. He can hear himself wheezing. He lifts his head up to see his cousin assisting him. His twin sister was carried by the Marquis, after losing her consciousness. Is this the effect of the vow? If he knew he could've chosen death instead of suffering this every month. I and my sister became a side character in the novel we happened to read. We are one of the so-called barbaric swordmasters in the novel's world. The Serebryan. Our sole purpose? To save a bastard who shamelessly died in the novel. (Hetero and Homo relationships are present.) Cover: Source from Pinterest. Credits to the owner. Update: Every Month
32 parts