Obanai Iguro's sad past
source：Amazon.co.jp
Obanai Iguro's clan is a "thief", and only girls are born in the clan, and Obanai Iguro is a boy born for the first time in 370 years.
Obanai Iguro has been in prison since birth, and his family has been eerily kind to him.
Obanai Iguro, who turned 12 years old, has been released from prison, but the clan has decided to make him a sacrifice to the "Snake Demon".
Also, Snake Demon cuts Obanai Iguro's mouth because he wants to make him look like himself.
Obanai Iguro, who felt his life was in danger, decided to run away, and "Flame Hashira" he met while on the run defeated the Snake Demon.
And Obanai Iguro was told by his family that 50 people died because you ran away, so he became a swordsman to know the value of his existence.
Obanai Iguro's personality change
source：https://utamonogatari.jp/
Obanai Iguro is in a relationship with Mitsuri Kanroji.
Until the middle of the story, he hated Tanjiro Kamado, who was on good terms with Mitsuri Kanroji, but in the final battle, Obanai Iguro and Tanjiro Kamado fought side by side.
Therefore, it seems that he recognized Tanjiro Kamado, who was necessary for "Demon Slayer Corps".
The relationship between Obanai Iguro and Mitsuri Kanroji
Obanai Iguro and Mitsuri Kanroji are lovers in "hashira".
They usually do their missions remotely, but it seems that Obanai Iguro sent a letter of love to Mitsuri Kanroji.
In the final battle, Mitsuri Kanroji is seriously injured, and Mitsuri Kanroji dies in Obanai Iguro's arms.
In addition, Obanai Iguro was also seriously injured, so it seems that he lost his life to follow.
In the world after that, the two people who were reborn became a couple, and the appearance of running a restaurant on good terms is drawn.