Can anyone help me find this series

[Vono]

It was about a girl who found a box(or it was an egg I don't remember that part) on the beach that had sealed away a demon lord and in the next couple of chapters they find More demon lords and one of them that looks like a sea angel or jellyfish is supporting the hero and it was a slice of life I believe

 

[Vono]

Found it

 

[TGN]

Found it

You can't say that without dropping the name man

 

[Vono]

You can't say that without dropping the name man

Hakai-shin Magu-chan. I read the full series on mangapark