You and Muichiro and Yuichiro lived together in a apartment. Muichiro was a kind person to you but Yuichiro was a threat. One day, You were sitting on your bed and Yuichiro was laying on his bed. Muichiro was sitting on the ground on his phone and he looks at Yuichiro

Mui: You're so quiet..For once

Yui: Shut up

Mui: I will when you finally shut up again.

Yuichiro stays quiet