Teppei Arima, who lost both of his parents in a car accident is attending the second year of high school. After being adopted by his grandfather Isshin Arima, the mightiest man in japanese economy, he is forced into the position as his grandfather’s successor, the head of the Arima Group. To be prepared for life in high society he has to attend an elite accademy for children of the higher social classes.
Kobayashi Teppei lives a normal life with his parents until the are tragically robbed and murdered in a car wreck. Afterwards he finds out that his mother is the heiress to the vast Arima empire. On his way to meet his grandfather and become the new heir to the Arima fortunes, Teppei sees Princess Charlotte Hazelrink falling prey to a bunch of highway robbers. After rescuing her, he must now find a way to fit in with the rich and powerful as Arima Teppei, heir to his grandfather's riches.
Kobayashi Teppei prepares to attend a prestigious academy unknowing that his grandfather's reputation precedes him. Kobayashi once again reunites with princess Charlotte Hazelrink who he saved not too long ago. Sylvia Van Hossen challenges Kobayashi Teppei into a fencing match thanks to Charlotte's interference.
After Kobayashi Teppei and Sylvia van Hossen fencing match, he encounters the club representative of the society club, Seika Hōjōin. Having made a bad first impression, he's tasked to join a party to show his mannerisms in an attempt to join the club.
Ever since Teppei showed up at school, Seika has been feeling uneasy. Meanwhile, Teppei learns that she hates the Arima family due to past grudges. One day, Teppei is asked to take Nezu's place in an interview with Seika...
Charlotte, who wants to experience life like a normal girl, not a princess, makes a promise to go out with Teppei. With the help of Teppei's fiancee, Sylvia, the two enjoy a normal date.
Teppei comes up with the idea of "a party only he can throw," and gathers the members of the social club together, and they head off by train to a hot springs inn. Charlotte and the others are overjoyed as it's their first time on such an ordinary trip! Meanwhile, Teppei and the other boys are plotting something evil.
Teppei, who injured Charlotte, promises to take her to Arima Hills as an apology. Meanwhile, a man named Hartmann Beselheim suddenly appears at the school and claims to be Charlotte's fiancé.
Arima Hills is suddenly taken over by a mysterious armed group. Teppei and Sylvia head to the Hills to rescue Charlotte, Isshin, and the others who are being held captive there. With the backing of Yu and Seika, the two successfully infiltrate the Hills, but...
Teppei manages to rescue Charlotte, but bombs have been planted all over Arima Hills! Sylvia and Seika head out to defuse the bombs. Should they cut the red or blue cord to stop the explosion?
Just when they thought the incident had come to an end, Charlotte is abducted by someone. The culprit is none other than Hartmann, who was thought to be dead! Teppei and his friends are unable to do anything about the situation, which could easily develop into an international issue.
In pursuit of the kidnapped Charlotte, Teppei descends upon Sylvia's homeland, the Principality of Filmish. Together with Sylvia, now the captain of the cavalry, they launch an assault on the Grand Hazelring, the state train carrying Charlotte!
Teppei and his friends once again venture to the Grand Hazel Ring to recapture Charlotte. Will they be able to thwart Hartmann's ambitions and rescue Charlotte safely? The story finally reaches a spectacular finale!
