A new student Yura, joins Rikuo's class. She knows a lot about youkai and can sense their presence. Rikuo's friends decide to form a paranormal investigation group and decide to have the inaugural ceremony at Rikuo's house since they've heard rumors of it being haunted. Much comedy ensues while they explore his house against his wishes. It comes out when they are attacked by a rat that Yura is an onmyouji (exorcist). While Kanna and Yura are heading home they are attacked by a group of youkai. (thetvdb.com)