Train Heartnet, also known as “Black Cat,” was an infamous assassin for a secret organization called Chronos...until he abandoned that cold-blooded existence to live on his own terms as an easygoing boun...

"Adventurers" are the group of people who set off on the adventure to defeat monsters of different ranks. The adventurers are divided into many categories according to their fighting style, eg. Monster Users...

In this world, there are mysterious machines known as TREMORS. The reason they came and who built them are still unknown. The most mysterious part of the tremors, however, would be their ability to continuou...

Akira's older brother, Atsushi, has been missing for two years. One day, a mysterious woman who seems to know Atsushi's last known whereabouts appears and offers to take him and his friends there : to the is...