It's Time for Training!
Hilda recovers and apologizes for being unable to help. Oga decides to become stronger in order to protect everyone and seeks Aoi's grandfather to train him. Oga's older sister is revealed to be a former leader of the Red Tails. After seeing Kouta at the shrine, Oga thinks that Aoi Kuni is actually Aoi's cousin. Oga and Teimo's Shadow Group receives pointless training from Aoi's grandfather. Saotome and Tojo talk about the incident, however Tojo doesn't understand everything about demons and mistakes them for bears and Saotome's friends.
Aired 13/11/2011EP 42 - It's Time for Training!

Beelzebub
Oga Tatsumi is a first year student in Ishiyama High, a notorious school for delinquents. One day he sees a man floating by, and the man suddenly splits in half to reveal a baby boy inside!
(Source: Crunchyroll)