Don't add this book to your Reading List. I can assure you that it will not exceed 15 chapters.
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During a fierce crusade years ago. A forest of the elves had been burned down, wiped off the map of mankind. In the midst of that bloody and chaotic battlefield resounded the loud cry of a child; an elf girl drifted down the river in her cradle with the hope of a brighter, peaceful dawn.

When the racial war ended with a fragile peace, the little girl from that day; named Alasta continues to live a peaceful and happy life in a human town where she was found by a church. Until the hero from another world was summoned to this unpredictable land for his journey to conquer the demon's uprising. She should have never come, but a mistake, or perhaps faith was made from the higher aboves, calling for the frail little girl to pick up a shield and be a strong warrior for the frontline.

[The Tank System]
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The characters can be hurt and can die, but I won't force it for shock-value.
Will have slight gore (very minor to the point of can't call it gore but I'll add the tags anyways) when there's a combat scene, which is rare tbh.
Elves in this world are Tolkien inspired, not Japanese LN inspired, with appearance modification.
No planned romance, GL, BL. It'll be there when I feel like it, that means rest assured it won't be there.