Ryuhei Tamura announced in the 13th issue of Shueisha's Weekly Shonen Magazine that his series, Beelzebub, will end on Monday, February 2014 with a total of 27 volumes. He will be starting a spinoff series in Jump Next!! magazine in May 2014. The 27th volume will be release in June 2014. The manga has not been licensed by any western manga publishers as of now.
For those who are new to Beelzebub, here is a plot summary:
"Strongest juvenile delinquent" Oga Tatsumi, in the most random events, finds himself with the infant son of the Great Demon King and threat to humankind, Beelzebub. After being "greeted" by the baby's maid and caretaker, Hilda, it become obvious that Beelzebub doesn't want to leave Oga's side. With his close friend Furuichi and a bunch of other characters on hand, Oga now must raise baby Beel and prevent the world from destruction.