After his swift victory again Prince Kaiser, Win Kirifuda is invited to enroll into Maihama Academy, a school where students learn about Duema. He thought it would be like a dream, where he could duel every day, but reality sets in as Win realizes that it's just like a normal school where he attends boring classes... So, Win's decided to form the "Duema Saikou Club" to enjoy Duema to the fullest with his new friend Ugata and with some familiar faces coming back to liven up the club!. The four Duema kings, the D4, Prince Kaiser's ambitions, and a mysterious entity that controls the school from behind the scenes........ A new day beings for Win at the school where various mysterious surround around him. Follow Win Kirifuda as he explores the school's many locals and Duel his way to the top in the Duel Wars tournament to see who is the strongest Duelist in all of Maihama Academy.
—Duel Masters Wiki