Masked Arrival: I Can Only Transform into a Strange Knight

[Complex, Spring Things, Passersby, Dragon Maid...] I traveled to the era when Kamen Riders came, this was an era where knights and weirdos coexisted, and I awakened a system. The most powerful alien knight system. When I thought I could punch and kick and be invincible, I found that the world is not as simple as I thought. Dragons, angels and demons. Why is Hikigaya Hachiman here if not? [This work takes place in a university, and the protagonist and others are all adults]