As Miss Beelzebub Likes it.
A Bit Bitter, Bibliomania; Go Forth, With Brownies.
Anime · 7 Nov 2018 · 23 min Crunchyroll
Available on Crunchyroll
S1, E5: Mullin visits the Pandemonium Library with Azazel and runs into a sleepy bookworm and an ancient demon; Later, Belphegor wants an excuse to talk to Azazel, so she starts making brownies with Beelzebub.
Anime · 7 Nov 2018 · 23 min