Minase Youmu to Hontou wa Kowai Cthulhu Shinwa  

Youmu Minase and Really Weird Cthulhu Mythos, 水瀬陽夢と本当はこわいクトゥルフ神話

On a typical day at school, a young girl named Minase Youmu was kidnapped in the mountains. Her captors claimed that she had taken some kind of medication and there was no going back. Fortunately for her, a retired detective named Sanpouji Kotetsu happened to be passing by and rescued her. He quickly brought her to the police station where investigator Naru Asuka and her psychic partner Hayama Reiichi took charge of the case. The team must determine who kidnapped Youmu and what was done to her before it's too late (if it hasn't already).