Isekai Adventure in the Dimensional Cube

"——Dimensional Cube User Manual——"
"One: The Dimensional Cube can automatically absorb energy from the dimension, once a month, it may randomly open a dimensional passage for Dimensional Travel."
"Two: The Dimensional Cube has the feature to convert different Dimension Power, available for use at any time."
"Three: The Dimensional Cube includes a storage space, available for use at any time."
"Four:......"
This is the story of a man who once was unable to choose his own future, who in this life vowed to live for himself.
Carrying the Dimensional Cube, Reiger arrived in a world of swords and magic, wandering through various dimensions, hoping to find redemption in this alternate world.