with periodic exceptional phenomena, more commonly known as bugs. He works as the unofficial assistant to his landlady Kasane Himesaki, a leading researcher in the field, and they study the effects and impact of these mysterious abnormalities. Some of the bugs bring fun, others intrigue, and still others cause inconveniences to their daily lives. In their ever-changing world, there's only one thing that's certain--the most ordinary moments can be the most extraordinary of all!