Within a Hollow Heart - Chapter 141: Volume 2, : "Beneath the Frozen Sky"

She died with her eyes wide open, waiting by the river for three days and three nights, only to be greeted not by her husband, but by her benefactor. As she looked at the blurred figure, her heart was deeply moved, and she silently made a vow: if she could be reborn, she would definitely marry him!… Later, she really was reborn.

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A surgeon accidentally got the blessings of a system, shocked the medical industry, and rejuvenated countless people.

- Description from Novelupdates

I banished the protagonist.

Shit. If only I had transmigrated a short while before.

Time travelling from the majestic era after the Recuperation of Reiki, he became Kimura Kazuki, a 16-year-old high school student in Japan, one year before the Reiki Recuperation.

Tentatively, he set out to hone himself to the bone, burning candles at both ends to stockpile resources in preparation for the imminent Recuperation of Reiki. His goal was to be many steps ahead of all humanity when the time comes.

However, it seemed like fate had decided to play a cruel trick on him.

One year later, the Recuperation of Reiki… did not happen as expected.