Yuutarou is an ordinary student at Yatsuya Gakuen with a slight interest in the occult. It was the last day before summer vacation, and he still didn’t have any special relationships with the girls in his class. That all changed when his osananajimi Yuumi invited him to come to the school that night for a ‘courage test’.

She came completely prepared, dressed in tactical gear, pressing an airsoft gun into his back and forcing him down the eerily quiet hallway. He heard faint laughter and turned around, and Yuumi had already dashed out of sight. The strange creaking and sounds of running… could this be the paranormal encounter that he wanted!?