Undead Summoning: An Army of One

Aisen Thorn, a D‑rank undead summoner, awakens a special system that lets him summon countless skeletons. Belittled by his family and overshadowed by adopted genius Ade Thorne, he flees to Woodland Academy. There he meets Sijia Clyne, a powerful S‑rank frost talent. Principal Lane supports Aisen amid prejudice. Vicious Ade colludes with alien invader Chiji, plotting to conquer their world. Aisen must wield his growing undead army to fend off enemies, rescue Sijia and defend the planet against the incoming extraterrestrial army.