Anime Crossover: From the Start, a Rabbit Tank

After transmigrating into a world where monsters invade and countless fictional universes converge,

he becomes one of the world's few Kamen Riders.

Kiryu Sento starts out with the Build Driver and the Rabbit Tank form!

And then...

Cross-Z, the Galaxy Dragon, the Golden Rabbit and Silver Dragon...

The Doctor Fullbottle combined with the Invincible Player Fullbottle equals Kamen Rider Build's Invincible Player form.

The Oma Power Fullbottle combined with the Zi-O Fullbottle equals Kamen Rider Build's Oma Zi-O form.

Eri, Utaha Kasumigaoka, Kaguya Shinomiya, Chika Fujiwara, Umaru...

This novel and its characters are entirely fictional. Any resemblance to actual people or events is purely coincidental. Do not imitate.