Tanjiro keeps asking his friend and classmate, Yuichiro, to meet his twin, Muichiro, but he warned him but he ignored him, he said if he meets him, he won't be the same after that, was he right?

Muichiro is a young boy, becoming a pillar in the age of 14 is very rare and exhausting. He is having hard time remembering stuff. On the other hand, Tanjiro is having hard time not exactly with remembering stuff, but with concentration breathing. After intense thinking, he decides to approach the Mist pillar, eventually both agreeing on a certain 'Deal'. Tanjiro will help Muichiro with his memory and Muichiro will help Tanjiro with concentration breathing. Will this deal turn their relationship into something deeper? __________ Finished!

Muichiro wishes to have a other life, he don't want to be a quiet and bullied student anymore but suddenly a boy named Tanjiro came to his school and changes it without even knowing.