"Sekai no owari" means "the end of the world". It may remind some of the title of novel written by MURAKAMI Haruki.But there is no connection between both.Fukase,lead vocals had been temporarily hospitalized at psychiatric ward at his teens.One day,he felt a deep sense of hopelessness there and a phrase"Sekai no owari" came to his mind. He however realized at the same time he only had to go up after falling down to the bottom of life. And as a result,he could overcome difficulties and pave the road to success of nowadays.
