Eight years ago, Francis' warrior father was arrested for deserting his post when a huge monster tide swept through Sharnwich City. Francis is determined to clear his father's name and save him from his death sentence, but that's easier said than done when he's a low-level warrior hated for being a traitor's son. However, things take a surprising turn when he's betrayed by his party and left to die in a monster lair. Thanks to the sudden activation of a mysterious warrior system, Francis' lethal wounds are healed and his fighting skills are boosted. Not long after he escapes danger, he also learns that the truth behind what happened at Sharnwich City is hidden within a dangerous restricted area teeming with high-level monsters. It's up to Francis to tango with fish lizards and level up so he can get to the bottom of the truth once and for all!