Legendary Youngest Son of the Marquis House

A brief description of the manga Legendary Youngest Son of the Marquis House:

I came here with only the goal of revenge.

I overthrew the Tulkan Empire, a single nation that dominated the continent.

I had always succeeded in gaining victory. I had accomplished all I needed to and was satisfied.

That’s why I accepted my approaching death. I no longer had a reason to live.

And so my heart stopped beating.

I definitely felt it stop.

However, what in the world happened?

“It’s not black magic and it doesn’t seem like an illusion either.”

A boy with short, black hair was reflected in the mirror.

I looked exactly like when I was 14, which was 20 years ago. A young boy, who hasn’t lost his baby fat yet, patted his cheeks and murmured, “How is this possible?”.

I had returned.

To the time filled with my regrets.