do i save my older sister or this world? | 要拯救我的姐姐還是這個世界？

[18+] ᴀ ᴅᴀʀᴋ ꜰᴀɴᴛᴀꜱʏ ʟɪɢʜᴛ ɴᴏᴠᴇʟ.

As Demons continue to ravage the iron-walled town of Longden, Amae and Oto are its magicians, pledging their lives with other warriors to defend against the seemingly never-ending attacks. But rumors of a powerful Demon Master disturb the area. Neighboring cities are falling. Food and supplies are running low. A harsh winter is inevitable. As the number of death start to rise, the Elders finally agreed with assembling a small rescue team to seek the powerful Heavenlight Kingdom for help.

On their first and perhaps last adventure to the dangerous Outside, the siblings vowed to save their home before it falls to the Demons.