Anime girl with pink hair and a skirt holding a sword

A standing girl holding a katana , pink hair, white blouse and short Japanese high school sweater , short blue high school skirt , knee-length sister , pose sexy, camera angle tilted from bottom to top , post-apocalyptic scenario , clouds in the sky , a biker with a red helmet and a red motorbike passing sideways with a submachine gun in his hand shooting backwards at some zombies in the background.