Yukikaze's words still echoed in Hikaru's chest. The great army of Kasumi no Kami was attempting to cross Mikazuki Pass——. That night, Hikaru could not sleep. She sat upon her futon, hugging her knees, staring up at the dark ceiling. Kagetora's wounds were not yet fully closed. Even if she tried to stop him from marching, that man would never listen. She did not have the words to stop him. But——there had to be something she could do. A map unfolded in her mind. Records of Sengoku-period battles she had devoured during her history major. Ambush tactics at mountain passes. Methods of dividing a great army using narrow terrain. And what she had learned in modern chemistry class——when sulfur and charcoal were mixed in specific ratios, they would undergo rapid combustion approaching an explosion. （I can do this. I might be able to do this.） Hikaru stood up. ＊ The main castle hall was already stirring before dawn. From down the corridor came the overlapping sounds of armor and foots