Alfonse and Sharena, the prince and princess of the holy kingdom of Askr, battle against the invading Emblian Empire.
From the video game Fire Emblem Heroes
When Light Yagami isn’t committing mass murder using a supernatural notebook, he’s a hardworking student who often helps his little sister, Saya, with her homework.
From the anime series Death Note
Takaharu Kurenaino provides emotional support for his little sister, Aria, even when the circumstances are strange and unsettling to most people.
From the anime series Occultic;Nine
What happened to respected ace pilot Ralph Werec? His little sister, Sara, follows in his footsteps and joins the military in order to find out.
From the anime series Soukou no Strain (Strain: Strategic Armored Infantry)