Kris, Riyan, Eris, and JB all formed a group a few years back to find adventure and finally use the fighting skills taught to them since they were little. This was done because there was event that occurred centuries ago that caused monsters and other creatures that everyone thought to have just existed in folk tales to appear and disappear in a short amount of time. Many people were massacred and only elite soldiers some leaders survived this attack that lasted only 25 hours. They believed that some of them still remained on the Earth and at times set out to look for them in nearby caves and some forbidden ancient ruins.

       Riyan Hazel is a supposedly normal girl who wanted to find her twin, their adventures made this a side mission. That's why no one knows her reason for this. In her search, she is confronted by a student named Taku who claims that he's been looking for her for a long time. But is this true? What secrets does he hide, and is it of Riyan's interest?