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Before I knew it, I was in another world.
The protagonist, who was once a Japanese salaryman, wakes up to find himself reborn as a baby.
It seems that he died from overwork and was reincarnated in a different world...
Born into a noble family, but with a mother of concubine status, his official rank is that of a commoner.
In this life, he finds someone he wants to protect with all his heart — his beloved younger sister, born from the same mother.
And it seems his little sister doesn't want to ever let go of her big brother either...?
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