I love Dragon Maid, what's your favourite manga?

Slowed down on collecting the spin-offs but the Kanna manga is also very solid and has some of my favourite moments in the whole series. I still love the main series. Not as into the Elma series as much but it's also nice. Also yes I like protecting my manga with plastic sleeves. I know it seems to be a love it or hate it sort of thing I just ain't a fan of wiping dust off my books when I'm grabbing them from my bookshelf. What are your favourite series?