Available as both manhwa and novel.
I Alone Am an EX-Class Summoner
Also known as: Na Honja EX-geup Sohwansu · 나 혼자 EX급 소환수 · Only I Have an EX-Grade Summon · Chỉ Mình Tôi Có Vật Triệu Hồi Cấp Tối Thượng · I Alone Have an EX-Rank Summon · Solo EX-Rank Summoner
Summoned creatures have ranks, from the lowest F-rank to the highest S-rank... but something’s strange. Why is my summon EX-rank?