How Tanjiro Briefly Turned Into A Demon In Demon Slayer?

Pavas Gagneja
Jul 9
3 min read

SPOILER ALERT: This article contains major spoilers from the Demon Slayer manga, including shocking plot points, final battles, and major plot twists not yet covered in the anime. Proceed only if you're caught up or don't mind having key story elements revealed.

Tanjiro is known to be one of the purest and most kind-hearted characters in all of anime. He always fights for good and protects others, even if it means risking his life. But in one shocking twist, Tanjiro actually turned into a Demon. This surprising moment left fans speechless and changed the way many saw him.

This sudden transformation didn’t happen randomly. It came after one of the most intense battles in the series. When Muzan, the strongest Demon and the main villain, was finally defeated, everyone thought the danger had passed. But in reality, the worst was yet to come.

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How, And Why Tanjiro Turned Into A Demon?

Before Muzan was fully destroyed, he had one final plan. He realized he couldn’t win in a direct fight. So, in his last moments, he used his remaining strength to inject his blood into Tanjiro. Muzan believed Tanjiro was the perfect person to carry on his legacy. Not only was Tanjiro physically strong, but his willpower and potential were unmatched.

Muzan hoped that by turning Tanjiro into a Demon, he could live on through him. This was not done out of kindness. It was a desperate act by a villain who didn’t want to accept defeat. When Tanjiro opened his eyes after the battle, he was no longer human. He had turned into something new — a Demon with incredible power.

Demon Tanjiro’s Power

As a Demon, Tanjiro became extremely strong. His body could now regenerate, and he no longer felt pain or exhaustion. Some even say he was stronger than Muzan himself. But this power came with a terrible cost. Tanjiro lost control of his mind, and he almost attacked his own friends and even his sister, Nezuko, who had just turned back into a human.

What made this version of Tanjiro so scary was that he still held onto his fighting instincts. He used his Nichirin Sword, combined with his new Demon abilities, to attack anything in his path. If he had stayed a Demon for much longer, he could have become the strongest and most dangerous one ever created.

The Power Of Love And Humanity

Nezuko trying to save Demon King Tanjiro

Tanjiro’s friends didn’t give up on him. Even when he became a Demon, they tried to reach him with their words and emotions. Nezuko, now fully human, ran to him and called out to the brother she loved. Their bond was stronger than anything Muzan could create. Slowly, Tanjiro’s human heart started to fight back.

Kanao also played a big role in saving him. She used a special medicine made by Lady Tamayo that could turn Demons back into humans. With perfect timing, she gave it to Tanjiro while he was still struggling inside. This, along with the love and support of his friends, helped bring him back to normal.

Final Verdict: A Twist That Showed Tanjiro’s True Strength

Demon King Tanjiro wakes up Demon Slayer

Tanjiro’s transformation into a Demon was short, but it revealed something very important. His strength didn’t come just from training or fighting; it came from his heart. Even when he lost control, his love for others and their love for him brought him back.

This moment made Tanjiro an even deeper and powerful character. It reminded fans that real strength comes from kindness, connection, and never giving up on the people you love.