He knew he wasn't insane. He couldn't be. He knew the voice by name, even though the name had never been spoken to him. He simply knew the name without ever asking. And after doing some research, he was able to match the name he knew to a known supernatural entity. Saika. Eventual Shizaya.
Chitstelneca:
Однозначно надо читать тем, кто любит хорошие истории. Плавное развитие событий (там же еще два тома есть!) живые персонажи и действительно интересный сюжет!