Alex (sixteen), the heir to a ducal house in the Kingdom of Arcadia, one day suddenly and without warning regains memories of his past life.

Apparently, his former self had been leading a slothful life and had a terrible reputation.

Amidst this, while memories of his past life as a corporate slave in his late thirties resurface and he is confused, he tries to adapt to his current life, but...

His actions appear different from before, leading to various misunderstandings.

As a result, he finds himself pursued by various women.

His former fiancée, a tsundere princess; his personal maid, a cheerful elf; a cool-and-aloof Dragonkin princess who challenges him to duels; a clumsy dog-eared girl he ends up taking care of, and more...

"I hate harems! How did it come to this?!"

Even today, his screams echo.

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