The Hero Laughs While Walking the Path of Vengeance a Second Time Novel Volume 6 was written by Nero Kizuka.

Metalia ambushes Kaito just after he completes his latest feat of vengeance, forcing him through a portal back to present-day Japan. Stripped of his memories, Kaito comes to terms with his tragic new reality—a world where almost everyone he knows is dead and the police surveil him around the clock on suspicion of committing a heinous crime. Even this fragile status quo is disrupted when an assassin nearly succeeds in taking his life. But the brush with death restores Kaito of his memories and powers, giving him the perfect opportunity to take revenge on his assailant and chart a course back to his partners in crime…