There is a magical school in the capital city. Boy Slay somehow lives in the same girls' dormitory for the reason of boys dormitory capacity. Everyone opposed the idea at first, but somehow learned to coexist together without too many incidents happening. The test time approaches, so students challenge in conducting magical experiments. Slay has his grandmother as a witch, so everyone wants his help with the experiment. How far can the gratitude reach?

[From vndbreview]