The Ghost Is Extinguished, I Hold Your Hand and Grow Old Together with You

What would happen if Tanjiro becomes a ghost in the finale? , What would happen if evil spirits occupied Japan? What if foreign powers also join this war? What would happen if characters from other anime worlds came to this world? Infinite multiverse, infinite possibilities! This is a story about family, friendship, love and regret. Beginning: Fireworks under the moonlight flickered in the peripheral vision of the old man and I. We sat quietly on the stool and talked about the past. Ending: It was late at night, and the old man's peaceful face showed a few wrinkles under the moonlight. "He said the sound of the firecrackers was too loud, and he asked me to only bring flowers when he visited me in the future." … "We are friends, right?" "You are a friend, a good friend, my supporter, my spiritual support, the channeler of bad emotions, you stand by my side, listen to me, support me, you are the one who is better than thousands of ordinary acquaintances." … "If it's the beginning of new snow, the full moon is in the sky, there are bright shadows below, and bright silver is flowing on top, and you are walking towards me with a smile. Between the moonlight and the snow, you are the third kind of stunning beauty." … Beginning: "I will never grow up, my grandpa will protect me like a big tree." Ending: "At that moment, the tree fell and I grew up." There will be some personal details about the character, please do not let anyone in. ) (Timeline slightly altered.)