Death March kara Hajimaru Isekai Kyusoukyoku (WN) - Book 16 - 16-80. God Keys

Imperial soldier Suldak Helansa joined the infantry regiment of the Grand Duke Newman in Bena province, participated in the Warsaw plane war, and rescued a young man in the forest battle. This qualified young man suffered some injuries. Injured, still a mute, Suldak brought him into the barracks, and what we are telling is the story of this young man of unknown origin…

- Description from novelbuddy

Duwei is born in this new world from Earth without making any sound, he does not cry, he just stares at the people around him. As he grows he does not speak and curses this new world in which he is forced to live.

His father a great general of insurance he must have aptitude for something, nevertheless he is not more than trash. Ignored by his family as the “Retarded” heir.

This is the story of your journey to discover the truths of this world and use the knowledge of your past life to remove your title of retarded, even if you have to become a devil.

A chance to change, to challenge destiny, making dreams a reality, and live a legend! A regular man gains a system that allows him to turn into a fish!

Not everyone wants to live a life filled with fame, riches, glory, and honor. Some, just want the easy life. To live a life that simply plays itself over and over, with a hint of spice here and there.