The younger sister when the older sister is not around

The older sister when the younger sister is not around

Expressionless? Mayu is Mayu, but Mio is also the type whose feelings you can never fathom

I like how she gives off an air of having no attachments to this world and the blatant sense of wariness

The younger sister in front of the older sister

The older sister in front of the younger sister

Onee-chan

Mio

Indeed, even though they're supposed to have the same physique, she ends up being the reliable one

She ends up acting all spoiled when she's next to her.

Basically, since the Amakura twins are always together, I imagine the lower expressions are probably their default ones in everyday life.