Usagi (Serena in English) is an eighth grader who is clumsy, a crybaby and who also gets bad grades. One day, she meets a talking cat named Luna, who tells her that she is Sailor Moon, a superhero. She has to fight monsters to save people from getting their energy stolen by evil beings. Usagi has some friends who fight evil along with her. They are named Sailor Mercury, Sailor Venus, Sailor Mars, and Sailor Jupiter. They make up a team called the Sailor Senshi ("Senshi" means "soldier" or "guardian in Japanese"). The Sailor Senshi are named after different planets in the solar system. Each of the Sailor Senshi uses magical powers to become a Sailor Senshi. They are also young Japanese girls. Their real names are not Sailor Mercury, Sailor Venus, Sailor Mars, and Sailor Jupiter. For example, when Sailor Mercury is not fighting evil, her name is Ami Mizuno (Amy in English). The name of Sailor Venus is Minako Aino (Mina in English). The name of Sailor Mars is Rei Hino (Raye in English). The name of Sailor Jupiter is Makoto Kino (Lita in English). Each of them has a transformation sequence where they turn into their Sailor Senshi form, with many colourful effects.