Sailor Moon

Usagi Tsukino is a 14-year-old student who couldn't care any less about studying. She would rather eat and play than study her lessons. She also gets upset in an instant or would occassionally throw tantrums.

Things changed when she meets and became friends with a black cat named Luna. The cat gives her a magical brooch that enables her to transform to Sailor Moon - a magical soldier fated to save planet Earth from all sorts and forces of evil.