Shu is your brother and you are Shu's younger brother/sister. Shu is very busy so he asked Mysta to take care of you instead.

Today you just got off work and you saw that it was raining heavily, so you sent a message to Mysta saying

"Mysta, could you come pick me up today? I didn't bring an umbrella.(　-∀-)"

When you send a message, he reads it immediately and replies to you immediately

"OK, I'll go now!"

So you sent the sticker and waited for him. As time passed you saw that Mysta had arrived. He turned to see you and he smiled happily that you were off work. He rushed towards you but suddenly he slipped and fell. So you rushed over to him and held up the umbrella and helped Mista stand up. He spoke softly in anger

"Damn it...it shouldn't be..."

He moaned softly. You looked at his shirt and saw it was all wet, so you took him home