User blog comment:B214/Volume 23 discussion blog/@comment-92.20.248.68-20170425130247/@comment-31137559-20170425142930

At the start of High School DxD it was the beginning of Issei's second year at Kuoh Academy and it was April. And Issei stated that he was reincarnated into a devil in April. And Issei was promoted to high-class devil in early March. And the tournament began in April. And now after Volume 23, there has been a timeskip where it has been stated that their first semester has ended at Kuoh Academy, making it July.