Demon Annihilation! Hot Blooded! High Numbers!

We agreed that the hot-blooded comic would give me a high-level math test? After traveling through time and becoming a new member of the Demon Slayer Corps, I looked at the roaring evil ghost in front of me and smiled. Taking out his mobile phone and playing "The Great Compassion Curse", the evil ghost covered his ears in pain: "What kind of new sun-shaped sword is this?" I calmly pushed up my glasses and said, "This is a high-tech salvation method in the 21st century." Just as he was preparing to continue playing "The Most Dazzling National Style", the system suddenly prompted: "Please recharge if your spiritual power is insufficient." The evil ghost and I were stunned at the same time. It pointed behind me tremblingly: "Um... Your teammates seem to want to hack me to death first..." Looking back, Tanjiro and others were holding knives, with complicated eyes: "What did you do with... Your mobile phone just now?"