Having just finished the main storyline of Honkai Impact 3rd and possessing the strongest power of Kamen Rider Build, Ye Feng returned to the real world through the system. Unexpectedly, the system eloped with the Herrscher of the End and transferred all the Valkyries with perfect affection points to the real world. Thus began his daily life of taking care of the Valkyries at home while going to school.

[Note: The System and the End have eloped.]

The protagonist only uses the build system, but that doesn't stop the author from creating hilarious content.

[The main storyline is mostly slice-of-life, and it's definitely a Kamen Rider story, definitely a Kamen Rider story—I'm saying it three times because it's important. Sometimes there will be time travel elements, sometimes it's Kamen Rider, sometimes it's a parallel world, sometimes it's the real world, and sometimes there will be cameos, but mostly it's slice-of-life stuff in the real world. If you don't like that, you can scroll away. Take it or leave it. Goodbye.]