What if Tanjiro was a Pure Saiyan? (DB X KNY)

The 'Mu' in Muichiro

He destroyed the water that held him captive.

Muichiro was coughing whilst remembering who that was inside his mind. It then hit him, it was his father. He thought, "My father was a woodcutter. And I, his son, also helped him cut trees." He finally stopped coughing but started breathing hard. He also started pulling the needles as he thought, "Ugh... Numbness... Really bad. This needle... If I didn't get out of that water container just now, I would've..." He then remembered Ubuyashiki saying,

"Don't think about things too strictly Muichiro. The moment you regain yourself. You can get even stronger."

Muichiro thought, "Oyakata-sama's face... Seeing his disease progress is so painful." He crawled to Kotetsu and picked him up while saying, "K... Kotetsu... Kun." Muichiro felt a presence behind and slashed the fish that tried to steal up from behind him. He started to cough again while thinking, "Lungs hurt. There's water in them." He starts to dwell on his past, "Mom caught a cold which turned into bronchitis so she died. It was a stormy day. My dad went to get medicinal herbs for her but fell off a cliff and died." Kotetsu brought him back to reality when he started saying while being weak and slow, "Tokito-san... F- forget me... Go help... Haganezuka... san... protect... the blade." But Muichiro went back and thought, "My parents died when I was ten. I was alone at the age of ten. No. No. I was alone at the age of eleven. I had a twin. My older brother was named Yuichiro."

- Memory of Muichiro's (Narrated By Muichiro) -
Yuichiro and Muichiro both walked down a path with a bundle of sticks on their back. Yuichiro was the first to speak, "Compassion is useless to humans. No matter what good you do for someone it won't do you any good." Muichiro denies it, "No, doing good for others will come back to help you. That's was dad said." Yuichiro says, "The words of a man who died trying to help others are useless." Muichiro asks, "Why are you saying that? Dad was trying to help mom..." Yuichiro says, "Herbs weren't gonna cute her once she reached that condition. It was extremely dumb." Muichiro says, "You're so mean, nii-san." Yuichiro adds, "If he didn't go out into that storm, it would've been mom who'd just die." Muichiro yells, "Don't say it like that! That's too harsh!!" Yuichiro scowls while saying, "I'm only telling you the truth. You're making too much noise, so shut up. You'll call a boar here. The 'Mu' in Muichiro is the 'In' in ineffective. There's no point in having this conversation. The past won't change. The 'Mu' in Muichiro is the 'In' in invalid."

"My brother was a painfully frank person. I feel like I turned into him when I lost my memories. Living with him felt like a living hell. I thought he hated me. I thought he was a cold person. When spring came, someone visited us. It was Oyakata-sama's wife. She was extremely pretty. I thought she was the spirit of the white birch the first time I saw her. In the end, my brother unleashed a verbal lashing and chased Amane-sama away.

Muichiro said with surprise in his voice, "Wow! She said that we're descendants of the swordsmen. And apparently, we're amazing people who can use the first breath ever." Yuichiro states, "Not my problem. Just go get the rice." Muichiro beams, "Hey, let's be swordsmen! Let's save everyone who's suffering from the demons. I'm sure we ca-" Yuichiro cut him off by slamming his butcher knife into the carrots many times. It remained quiet after a while before Yuichiro started yelling, "Are you saying you can do something? Can some weakling who can't even cook rice alone become a swordsman? Can they save someone? Stop spouting nonsense! You're just like mom and dad! You're way too optimistic! What's going on in that head of yours? Mom broke down because she kept working without telling us that she was feeling sick. Dad went into that storm to get some herbs. Even when I told him to stop...! Even mom told him to rest so many times! Saving people is something only chosen people can do. We're children! Do you think we can do something just because our ancestors were swordsmen? Want me to tell you what we can do? Here's what we can do! Die like dogs out there! Because we're mom and dad's kids. That woman is just using us! She has to be planning something. We're done talking about this! Got it? Now go get the food ready!"

"We just stopped talking. Amane-sama kept coming to our house. My brother poured water on her once, and we fought."

- Later in The Memory (Also Narrated by Muichiro) -

"Summer cam. It was really hot that year. We were both really mad at each other. The nights were hot and the cicadas cried. Then the door opened while we were sleeping, and a demon came in."

Yuichiro went to investigate the ruckus but had his left elbow down to his hand, cut off. He screams as he drops to the ground and huddles with Muichiro. The demon said, "Shut up, shut up. Stop talking. You people are just poor woodcutters. You can't do anything for anyone. Whether you exist or not, nothing changes. Truly worthless lives." Muichiro held his elder brother as he bled. He then started to yell out loud as his pupils disappeared.

"The demon's eyes were deep red. I felt something for the first time in my life. It bubbled from the pits of my stomach. It was intense anger. I can barely remember what happened after that. I had never thought I could he capable of howling as fiercely as I did. When I came to, the demon was near death. Even though its head got crushed, it was still struggling. It was like it couldn't die. But the morning sun came up, and the demon crumbled to dust. Although I didn't care about that. I just wanted to go to Yuichiro. But my body felt as heavy as lead. My house was just in front of me, but it took me several hours to get there."

A bloody Muichiro slowly crawls to Yuichiro while thinking, "Nii-san... You're still alive... Nii-san." Yuichiro slowly says, "...dear gods, bud...dha... Please... Please... just... spare my brother... Un... like me... he's... A really nice... kid... He... wants... to be use... ful... and I... got in his way... I'm... the on... ly bad... one... If you're giving punishment... Just give... it to me... I knew... the whole time... The truth... The 'Mu' in Muichiro..."

- Back to Reality -
Muichiro held Kotetsu and laid him down while the words Yuichiro said played in his mind,

"...Is the 'In' in 'infinity'. If you ever do something to help others, you can bring out infinite strength. You are the chosen one!"

Muichiro grips his blade and develops a red mist-like mark on his left cheek and forehead.

Chapter 97: End.

-A Little Secret-
It is said that the marks that appear on Demon Slayers can shorten their lifespan to just twenty-five years. Whoever activates their mark above the age of 25 will die the day they activate it. But it was all just rumours inside the Corps. Unless...

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