1x51 - Beelzebub

Oga is trying to think of a way to perfect Super Milk Time before they're attacked again whilst Nene and the rest of the Red Tails are trying to get Aoi back into the group by holding a fake meeting at Aoi's place and so persuading her. Aoi's demon magic is revealed to be thanks to Koma, a perverted demon whom she acquired at Mapputatsu Temple. Oga has found a new milk bottle which will hopefully help Super Milk Time and is asking Furuichi to try it, who is obviously reluctant as he is "busy". Meanwhile, St Marian's High School for Girls have declared a battle against the Red Tails in order to overtake the Southern Kanto region as well as the North, however they are unknowingly defeated by Koma who runs around touching each of them and so making them feel weak and uncomfortable therefore being unable to fight.