Komainu-sama is Watching

is episode 51 of the Beelzebub anime.

Summary
While Oga and Beel train to perfect the Super Milk Time technique, Nene and the Red Tail girls come up with a plan to get Aoi back in Red Tails, and Aoi and Isafuyu talk about the little demon, Koma-chan.

Next episode preview
Koma-chan asks again what Kunieda's measurements are. Kunieda tells him to shut up and calls him a perverted dog. The two then introduce the synopsis of the next episode: A serious mystery where Saint Ishiyama Academy is shut down in a snowstorm and the delinquents are getting beaten up one by one like the legendary counting song. Koma-chan tells the audience to try to figure out this mystery. After Kunieda introduces the next episode, Koma-chan concludes by shouting "Next Beelze's HINT: Super Freeze Phenomenon!".

Trivia

 * The title of the episode is based off the title of the light novel series . Torii even proclaims that "Maria-sama is watching [them]".Taniyurikai.png
 * The "Next Beelze's HINT" phrase used by Koma-chan in the next episode preview comes from the "Next Conan's HINT" segments of the Detective Conan anime.

Anime and Manga Differences

 * In the manga, Black Baby Beel crams a cigarette into Zenjuro's nose. Compared to the anime, he pulls Zenjuro's cheek. Please see manga image and anime image.Black_beel_pulls_Zenjuro.png