Taisho Secrets are fun facts or comedic rumors related to their respective episode of the Kimetsu no Yaiba anime. They appear at the end of almost every episode after a short, cute/comedic scene with two characters, mainly Tanjiro and Nezuko. After the secret, the next episode's name is previewed.
Tanjiro states that he heard Urokodaki wears a mask because demons would make fun of him because his face "looked too kind".
Tanjiro states that the udon stand owner from this episode was born and raised in Asakusa and he continues to make udon in Asakusa because he loves it so much.
Unlike other episodes where Tanjiro opens with the comedic scene and does the Taisho secret afterward, he immediately begins with the secret. He states that Yushiro's hobby is to write in his "Lady Tamayo journal" and writes 7-10 pages daily. Following this, he opens the journal and reads two entries, both hinting at Yushiro's obsession for Tamayo. Tanjiro stops in the middle of the second entry and dismisses it.
Tanjiro states that all the kasugaigarasu crows have names and that his crow is named Matsuemon Tennouji.
In this episode, Nezuko is switched out for Zenitsu. Tanjiro states that Zenitsu becomes self-conscious in front of girls.
Tanjiro runs out of time to tell the secret as he is occupied cheering on Nezuko.
The Taisho Secret section is switched out for a new end scene called Tales of a Demon Slayer Academy. This section is a twist on the major characters as they are thrown into a typical anime high school setting with Giyuu as their teacher.
Tanjiro and Nezuko are switched out for Zenitsu and his kasugaigarasu sparrow. The sparrow states that his name is Ukogi because that's his favorite food, but Zenitsu only feeds him beans.
The Taisho Secret section is switched out for Tales of a Demon Slayer Academy. This section is where Zenitsu, the prefect, is in charge of checking the student's dress code in the front of the school gate. However, in reality, he's really checking out female students so he won't get yelled at by looking at them until his teacher, Giyuu, catches him.
Tanjiro and Nezuko are switched out with Inosuke and Giyuu who ignored Inosuke the entire time as he tries to get Giyuu's attention, at one point mentioning that Tanjiro's favorite rice ball flavor is plum seaweed while Zenitsu prefers salmon. 
Tanjiro states that after every festival, his father and mother would always toast rice crackers for him and his siblings.
Tanjiro and Nezuko are switched out with Shinobu and Giyuu who refused to speak to her and she asks him if he is still mad what she says about how nobody likes him. Giyuu points our that Shinobu can’t stands cats and dogs especially with any animals with fur although she denies it.
Tanjiro and Nezuko are switched out with all the Hashiras. According to Shinobu, the first one among us to speak gets to greet the Master, Kagaya Ubuyashiki so they all had butterflies in our stomachs until the Master got here.
In this episode, Nezuko is switched out for Shinobu. Tanjiro states that Aoi has been training under Lady Shinobu, he heard she can concoct the simpler medicines.