The Game Descends into Reality, and I Logged In a Hundred Days Early

[Savior story + passionate with a touch of chuunibyou + decisive but not indiscriminately murderous + characters with their wits about them + plot and logic focused + careful, step-by-step planning]

The game Beyond the Extraordinary descends upon the real world and destroys it in just three short months.

With only a second left before the world's end, the Savior's Flame organization sacrifices all its members and uses an Hourglass of Time to reverse the flow of time.

They send the organization's leader, Lin Mo, back to one hundred days before the game arrives.

Thus, Lin Mo enters the game a hundred days early and becomes its first beta tester.

Armed with all his memories, the perfect guide, and humanity's last hope...

Lin Mo swears that this time, he will save the world!