In a city somewhere on Earth, Philar is an ordinary high school student who usually visits the local game arcade after finishing his studies. One day, however, while at the arcade, hooligans decide to cause trouble that inadvertently involves Philar. To everyone's surprise he fights back; surrounded by some unknown power, he displays incredible fighting skills and easily wins the day. As the rumors spread about Philar, they come to the attention of Lunarena: an assassin sent by Azlar, Prince to Aguilas, to kill the legendary Sun, who he believes may have escaped to Earth. The beautiful Lunarena joins Philar in class posing as a new student. Taking no chances, she attacks Philar vehemently...can he withstand her master swordskills or her psionic powers?

Redmoon received the Korean Manhwa of Today award, and is also archived in the National Library of Korea. The series was published in English by ComicsOne; only six volumes were released before the publisher went defunct in March 2005.