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'Nichirin swords' in 'Demon Slayer' is a must-have weapon for every swordsman of the demon killing team, because the blade of nichirin swords will show different colours according to the attributes of the holder, so it is also called by swordsmen. It is the 'katana of Discoloration'. Typically, nichirin swords are in the shape of the Japanese samurai katana, but a small number of nichirin swords are tailored to the...