Only two people know the truth. So according to the canon Demon Slayer Fan book. Tanjiro's mother actually knew the location of the blue spider lily. Also, she took tanjiro there when he was a kid.
Kie Kamado knew where the Blue Spider Lilies bloomed, and showed them to Tanjiro Kamado when he was very young. This is why he was vaguely able to briefly recall them when his life was flashing before his eyes during the battle against Rui.
Over a hundred years after Muzan's death, botanist Aoba Hashibira discoverd samples of the Blue Spider Lily and figured out that it only blooms at daytime two or three days a years, and when it does, in only blooms for a short period of time and then it closes back up, ressembling that of a big horsetail weed.
In episode 8 of Demon Slayer's second season, a certain blue flower appears during the episode. They are also seen in the outro of season 1. These flowers are Blue Spider Lilies and are very important to Muzan Kibutsuji, the anime's prime villain.
Tamayo knew everything about demon phisiology and she was an expert at Medicine, same as Shinobu (the latter being an expert on whisteria poison and other flowers). It is possible that either Tamayo or Shinobu found the blue spider lily that Muzan was looking for and together they crafted this "poison".
Yushiro is in love with Tamayo and is willing to do anything to protect her. He finds Tamayo very beautiful. He is very obsessed with her and will attack and insult anyone who comes near her but him.
Demon Slayer hints that consuming the Blue Spider Lily can negate a demon's vulnerability to the sun, which is why Muzan spent ages hunting for the bloom. As the strongest being in the world, Muzan's only weakness is the sun.
The only reason why Muzan hates Doma is because of his insincerity and lack of emotions. This might sound odd, expecting emotions from a demon, but even a demon has to retain such tendencies to keep things in order.
However, she wasn't immune to the sunlight initially, as she got burned badly at first. So, in conclusion, her coming from a Sun Breathing user's lineage and not relying on human substance are perhaps the reasons for her immunity.
Post-Transformation
Sensing their despair, Doma offered a chance to him and turned both Gyutaro and Daki into demons.
3 Nezuko Is Revealed To Be A Day Walker
This also explains why Muzan is after her, he wants to devour her in order to gain the ability to walk in the daylight. Muzan has been looking for centuries of a demon that can conquer the sunlight.
Lycoris radiata, known as the red spider lily, red magic lily, corpse flower, or equinox flower, is a plant in the amaryllis family, Amaryllidaceae, subfamily Amaryllidoideae.
Muzan's Descent Into Evil in Demon Slayer
Whatever medicine the physician had crafted using the Blue Spider Lily had effectively granted Muzan immortality, transforming him into the world's first demon. Muzan quickly began to crave human flesh and had no issue devouring humans to assuage his hunger.
Ultimately, Muzan was never able to find the Blue Spider Lily before his death at the hand of the demon slayers. It makes sense too as the flower blooms only during the daytime, thus it was already impossible for any demon to find it.
Uta (うた, Uta?) was the wife of Yoriichi Tsugikuni. She was killed by a demon while pregnant with her first child.
Kie Kamado knew where the Blue Spider Lilies were blooming, and showed them to Tanjiro Kamado when he was very young. That's what made Tanjiro indirectly know about this flower in his memory.
In the "Demon Slayer" anime series, demons cannot say the surname "Muzan" because it's forbidden in their society. Muzan Kibutsuji is the main antagonist of the Demon Slayer anime series, and he is the founder of the demon society and the source of the demon curse that plagues humanity.
Noting to himself that if he had not been interrupted by the sun, Tanjiro would have surely killed the Kakushi, Giyu wistfully begs in his mind for Tanjiro to stay who he was and die as a human. Tanjiro becomes immune to the sun.
Nezuko doesn't stand a chance against the Upper Moon 3
Nezuko is undoubtedly a strong demon in Demon Slayer and she proved her strength repeatedly. One situation that really displayed her true potential was the fight against Daki. She underwent a transformation and thoroughly overwhelmed the Upper Moon 6 demon.
Despite being a blood-thristy demon who has murdered several people, he has a set of principles he adheres to. One thing that Demon Slayer fans have noticed is that Akaza refuses to eat or kill women. Additionally, the Demon King, Muzan, gave Akaza special permission to do so.
3 Muzan Mainly Liked Daki Because Of Her Potential To Earn Money.
Does Muzan have a favorite demon? Despite the fact that Muzan. is always shown to have disdain for his creations, Muzan does in fact have a favorite. On that list is Naki, made due to a convenient blood demon.
1 Muzan Regretted Killing His Doctor
He shows his most human side to fans, wherein he admits to regretting murdering his doctor. He comments that had he been patient, the doctor would have cured him, and he would never have turned into a demon.
For those who have watched only the first season of the anime, they will be surprised to know that Muzan turns into a woman in the second season. He keeps transforming in order to hide his true identity, and he's even known to change into an 11-year-old child to hide from Demon slayers.
During his final struggle, and as a way to slow down the effects of the sunlight, Muzan adopts an enlarged demonic infant form, approximately as tall as a 3 story building when standing up. In this form he has very pronounced blood vessels across his body, small claws in his hands and fanged teeth in his mouth.