Webit's possible that this is the real reason that muzan recognizes tanjiro's hanafuda earrings and wants him dead, as he may know the truth as well that sun.
Webas a demon slayer, tanjiro kamada must master breathing techniques with his nichiren sword to kill demons, but tanjiro's first breathing style in demon slayer.
Webin a series about ancient demons lurking in the shadows and powerful swordsmen trained to stop them, it's surprising that one of demon slayer: