Upon waking from the earthquake, it was a different world with only men!

Today is the graduation ceremony at Shiritsu Sakurakou Girls' Academy Junior High School. To enjoy the final event that would color their remaining school life, the protagonist Hanomiya Miuri and her classmates waited in their classroom for the moment to arrive. The underclassmen had already gathered in the gymnasium. However, they get caught in a major earthquake during homeroom just before the graduation ceremony. After the earthquake subsides and they check their surroundings, things look different from usual... but why are there only men in the town?! The protagonist and her classmates are transported to another world along with their school building that has no underclassmen—what on earth are they supposed to do now?!