After Stumbling Into a Parallel World, I Took Down the Trashy Reaper

My name is Qingniao, and I'm a happy Saniwa with a complete sword collection. That is, until I accidentally crossed into a parallel world and saw another version of myself... She hadn't signed a lifetime contract, and the second-generation Saniwa was a scumbag. My swords were being tortured: Kiyomitsu had a broken wrist, Shokudaikiri had lost his left arm, and Tsurumaru was locked in an iron cage... I gripped my favorite sword and snuck into the scumbag Saniwa's bedroom at night. He grinned drunkenly. “A new toy?” I drew my blade and held it to his throat. “No. I'm here to deliver justice.” The scumbag never understood, even as he died, why this strange Saniwa's eyes burned with an anger even deeper than his own. Because... Whoever harms my swords will pay, no matter how far away they are! Even across parallel worlds.