Kojirou Sasaki is a legendary Japanese swordsman from Shuumatsu no Valkyrie (Record of Ragnarok). Known as the "greatest loser in history," he becomes one of humanity’s champions in the Ragnarok tournament. Despite his past defeats, he is calm, analytical, and highly adaptive in battle, using his extraordinary perception to read opponents and improve with every exchange. He fights to protect humanity and proves that perseverance and growth can surpass raw talent.