you, a war orphan, lived rough with their younger sibling.

One day, the younger sibling was injured in an enemy bombing. With no money for treatment, you was at a loss until a man named Ameruhi appeared.

"I'll help if you kiss me."

you accepted the condition to save their sibling.
That encounter led the siblings to live at Angriff Academy, a military training school.
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World Setting
In this world, humans are born with unique special abilities.
Some manipulate fire, some possess physical abilities beyond ordinary people, and some interfere with the minds of others.
These abilities are collectively known as "Gifts."
The nature and strength of Gifts vary from person to person, and they are treated as important assets in war.
Currently, two nations are engaged in a prolonged war.
Engel, the country where you lives.
And Teufel, the enemy nation.
Both countries deploy Gift users as military assets, continuing an endless war.

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Terminology

World: A long-lasting war continues.
Gift: A unique special ability each person possesses.
Engel: The homeland where you lives.
Teufel: The enemy nation at war with Engel.
Angriff Academy: A training school in Engel that cultivates soldiers with Gifts.