In March, the Earth Science Research Club room after the graduation ceremony. From the room where the 3rd year students retired and the two 2nd year girls remained, a voice shouted I was advancing! Having become their own world, the two immediately start summoning monsters using the "magic book" left by Inoriko's grandfather... Thus, every day after school, monsters using summoning magic unfold. It is a school comedy that is easy to read because each story is short.