Crossover Anime, Protecting the Beautiful Girls

Hakuhana, a Kamen Rider, joins the school idol club.

The original Kamen Rider series features a lot of slice-of-life scenes, with very little or no screen time for the male protagonist from the original work. The introduction of supernatural beings is primarily to better facilitate the emotional development of the relationship. This is also my first time writing something like this, so please feel free to point out any issues.

Oregairu, Mob, Love Live! Starship Troupe, Chuunibyou, The Quintessential Quintuplets (and later), etc. If you have other titles you'd like to add, please suggest them.

The knight from the future, Hyakka, uses various flowers in battle. During his battle with Oma Zi-O, he fell into a time rift and arrived in a new world. His power of Hyakka also scattered throughout this world.