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[No heroine + Chivalry + Late Heavens] Natsukawa Yuu traveled to the world of Kamen Rider Kuuga, and originally wanted to hang on to Yusuke Godai's thigh and hang out. Unexpectedly, while exploring the ruins of Mount Kurang, an accident caused him to open another forgotten sarcophagus - it was not Rick lying inside, but a defective belt full of cracks and emitting a strange black light! This belt allows Yu Natsukawa to transform into the strange-looking subspecies Kuuga. Although the power is only 70% of the orthodox Kuuga, it has a bug-level ability: every time he is knocked down, the belt will swallow part of the enemy's abilities and evolve into a new distorted form! When the Gurungi clan discovered that there was a lunatic who was specially beaten to level up, the entire war situation was thrown into chaos. The enemy that Yusuke Godai had to fight hard in the original work, Yu Natsukawa relied on his thick-skinned beating and fighting skills to train himself into a nightmare for the Gurungi.