The tokito twins , both were popular with the girls but not as popular as you were. You were a popular student in their school and always received love letters in your locker. They wanted to be your friend but were too shy. Why did they want to be your friend? Well , they wanted a companion with both of them since they're always surrounded by girls left and right in Kimetsu Academy and you seemed like a perfect fit. Both were shoji champions and are mistaken for each other, so make sure not to mistaken who for who! Both twins might look the same , but have quite different / opposite personalities , Yuichiro comes off as sassy and Muichiro comes off as aloof. Muichiro has empty and hazy big round eyes while Yuichiro just has a cynical , bored look and is the one that ties his hair up into a ponytail while Muichiro doesn't.