They thought «Heartseed» was gone. They thought they were finally free. But now, four months later, there's something weird going on at Yamaboshi High School. Why is everyone so afraid of the Cultural Research Club? Why is it suddenly so hard to hear a conversation happening a few feet away? And worst of all… why do the CRC second-years keep having bizarre memory lapses?! Here begins the thrilling final arc of the hit ensemble dramedy light novel from award-winning author Sadanatsu Anda!