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The protagonist traveled to the world of Kamen Rider Kuuga and became the King of Grunge, the unconfirmed life form Zero, and Daguba. Daguaba usually worked hard to become stronger, so in the final battle, he was slightly stronger than Kuuga, defeated Kuuga, and absorbed the power in Kuuga's belt. That day, the white demon was laughing wildly, but the black angel was lifeless. [Time Travel] + [System] + [Easy Semi-Invincible] + [With Female Protagonist] There are worlds like [Mask], [Armor], [Hokage], [Demon Slayer], etc.