I, at the Beginning, Signed on Top of Menyaji's Head!

When he woke up, Li You traveled through time inexplicably and fell from the sky! And standing on the ground is Kamen Rider Decade Kado Yaji. His opponent is the Zerg in Kabuto, and behind him is the heroine of the Build world, Ishitomi Misora? Just when Kado Yashi was about to pretend to transform, there was a "pop" sound and he was knocked to the ground by Li You. His attempt at pretending failed! "Congratulations to the host for successfully signing in Kamen Yaji and receiving the reward: Kamen Rider Decade Belt Decade Exclusive Arms!" Kadayaji: "Who are you!?" Li You: "I'm just a passing Kamen Rider." This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.