DelzGB

Stricken with a dull, boring life, Gael has already discarded his ambitions as a high school dropout. However, a chance encounter with death leaves him a choice: 
[“Meet your end accomplishing nothing, or continue on in an unforgiving world and learn what it is to live.”] 
Wishing not to die, he accepts the offer, being granted a new life in a fantastical, mysterious world of Gaia. In this new world, he is not granted an easy life, instead hunted as those like him, transported from Earth–”Outlanders”--are deemed to be executed on sight. 
He is not helpless, though, granted a unique gift upon being reborn in this world–
[Integrating system into body.] 
[...10%...]
[....45%...]
[....87%...]
[Integration complete.] 
[Gacha System initiated.] [Level: 1]

Gacha System: Reborn In The Hardest World

Looking to the side, the silence from Matteo and Florentine seemed as though they were already aware of the threshold he had teetered on. The more he sat there, seeing the looks in the eyes of those who waited by his bedside, he realized how fortunate he was to still draw breath.

"Whatever it was you summoned when the dragon was vanquished…It completely evaporated every drop of mana in your body," Blythe explained to him carefully. "Mana is our essence. It is no different from the blood in your veins. Normally, it's difficult to completely drain yourself–your body prevents that."

"I get it…I practically drained the life out of myself. Guess it is surprising I'm still alive, then," he said with a sigh.

Congratulatory Meeting