Beelzebub

When an unruly high school student named Oga helps a strange man floating down a river, the man unexpectedly splits in two and a baby pops out.

Alarmed by the threat of electric shocks, Oga resolves to find someone stronger and tougher who can successfully raise Baby Beel in his stead.

After losing the powdered milk he got from Hilda, Oga must buy yogurt drinks instead. The drinks turn out to be popular with another student.

Waking up from a dream to discover that Baby Beel is causing a flood, Oga rushes out to buy paper diapers and ensure the survival of humanity.

A strange new mark on Oga’s hand serves as formal proof of his contract with Baby Beel. The mark grows larger with each successful battle.

Hilda brings back a dangerous toy from the demon world for Baby Beel. Later, Oga and Furuichi find themselves having to play doctor with him.

While taking Baby Beel to visit the local park for the first time, Oga meets another high school student looking after her little brother there.

Aoi, the feared queen of Ishiyama High, returns to school victorious after a battle — and Oga is next on her list of opponents to crush without mercy.

Nene and Chiaki feel alarmed by Aoi’s indecisiveness toward Oga. Hilda develops an interest in Aoi after hearing Oga's stories about her.

Displeased when a stray kitten shows a fondness for Oga, a jealous Baby Beel eventually runs out of patience and challenges it to battle.