Welcome to Derentya, a universe where everyone lives in harmony and peace, each person bears a mark, called as the "Demon Mark" some are common, some are rare, and some are unique. the mark bearers also have a weapon that we all call as "A.R.K" or Arms in Retribution of Karma Regardless the peace and harmony, there will be always havoc and catastrophe happens in this universe. so let us accompany our heroes journey to return the peace of Derentya