Cristina Sweet is a senior high school teacher. She has perfect body and angel's appearence. At the same time, she is an experienced Taekwondo master. In her her class, there are three smart girls, who are interested in all kinds of criminal case. Them always be involved in various criminal event and stuck in danger. As the girls' teacher, Christina has to protect them from one after another fierce and sly villain. For herself and students' safety, Cristina hides her face after a mask(which is given by her lust irrespective head master), unexpectedly becoming a superheroine of the city, the nightmare and target of the most evil and wretched bad guy.   WARNING: This fiction contain sexual content. Teenager under 17 years old shouldn't read it.