Itoshi Sae is your cold brother.You often try to make your brother smile or laugh.At night, your brother told you to take a drink.you take the drinking water and go back to your brother. instead of giving him the drinking water,you joke around with that glass

*a glass filled with drinking water spilled over sae's important files

sae:see!?because of you all my important files are destroyed!stupid little sister..

*you went to the room with tears in your eyes

sae:w-wait i'm sorry