Haruhiro’s life was ordinal until he woke up in an unknown place with unknown people. He couldn’t remember what happened and where he actually located. When he left the building and looked around, he found a note which offered to play a game for survival. Haruhiro established a small army from the public who was in the same boat, investigated the Grimgar territory and started fighting for life. He became a Volunteer Warrior but didn’t know that was not a warranty for success. Unanticipated situations are just a beginning of a thorny path provoking tortures and adventures.