Beelzebub Episode 4 -

Hilda attempts to manage the situation with an interdimensional diaper, but it only provides a temporary fix. Oga decides they need a specialized "super absorbent" diaper he saw on TV.

The demon maid who coordinates the effort to save the city from the flood. Beelzebub Episode 4

In some versions (like Animax), Baby Beel is edited to wear a diaper throughout the series, though he is typically naked in the original Japanese broadcast. Hilda attempts to manage the situation with an