Arisa☆Good Luck

On an ordinary school day, the adorable 16-year-old Arisa Nishizaki leaves a love letter for her upperclassman in hopes of meeting him later. However, due to a string of unfortunate events, the letter falls into the wrong hands. While Arisa waits in vain, something inexplicable happens: she changes into an embarrassing, revealing suit! Arisa immediately knows that this has to be the work of her scientist older brother. As it turns out, the fighting suit he covertly implanted in Arisa's body enhances the luck of its wearer and therefore brings victory in any battle. When mysterious forces soon begin to chase her down, Arisa must utilize her newfound luck to escape both them and the gazes of her intrigued schoolmates. [Written by MAL Rewrite]