Practicing is easy when one has infinite skill points.

∞ is the symbol for infinity.

What happens when one has infinite skill points?

Reliving a new life, with infinite skill points, any skill can be instantly maxed out.

...

This is a story about an ordinary person traveling through a different world and murderizing everyone with infinite skill points.

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The MC is a person that doesn't know hesitation when it comes to putting people to sleep.