[Secret Realms + Class-Builders + Kamen Rider + System + Invincible at the Same Rank + Decisive and Ruthless]
When Huoyu awakened his class, he became an alchemist.
Drawback: Almost no combat ability.
Advantage: He awakened the Kamen Rider System and obtained the alchemy blueprints for the OOO Driver, giving him tremendous fighting power.
Behold! The birth of history’s strongest alchemist, Kamen Rider, breaker of common sense, and savior of the world!
The protagonist will mainly focus on the OOO belt, with few other belts appearing.
The upside is that he’ll explore the power of the OOO belt in depth, rather than introducing a bunch of belts and giving each only a cursory treatment.
This book features a well-developed and clearly defined progression and power system.
It feels like the protagonist doesn't know about things like Kamen Rider, but it also feels like he does. He even doesn't know about some combinations in the plot, and he doesn't even know some things about Enoch.
It's all research. You have to let him know alchemy.