"Alright! UR (Ultimate Rare) King Arthur has come!" In a world where demons are rampant due to an invasion from another dimension, there was a man who continuously played gacha games. His name was Yanagi Kamuri. A gacha fanatic, totally consumed by his love for it, he was a true gacha addict. One day, Kamuri faced an attack by demons. Only those with skills, known as the Gifted, could fight against them. Without any skills, Kamuri had only one option: to flee. During which he encountered Zeri, a princess from another world, a true royal inheriting her royal family skills. This encounter greatly changed Kamuri's fate. Amidst another demon attack, Zeri entrusted Kamuri with a skill she couldn't master herself. Combined with Kamuri's obsession with gacha, this skill transformed into a unique gacha skill only he could use. To save Zeri and fulfill his dream of endless gacha pulls, Kamuri begins his counterattack! With desperate do or die gambles, he summons the mightiest of heroes!

Suddenly finding himself in the Sengoku era, regular high school student Sagara Yoshiharu is about to be killed on the battlefield. He is saved by none other than the man who was destined to become the infamous Toyotomi Hideyoshi, who dies while saving him. With the course of history now changed due to Yoshiharu’s actions, he tries to make things right again, but it seems that history is taking a different course than the one he learned in school. Oda Nobunaga is now a brilliant but young girl named Oda Nobuna. Yoshiharu starts working under her command while attempting to bring history back to its correct course and find his way back to the present world.