And Then There Were No Delinquents

is episode 52 of the Beelzebub anime.

Summary
It's a snow day, and Oga and the rest of the Ishiyama delinquents show up for class to find no one is there. Kazuya and Azusa appear to help them, but when they find delinquents getting beat up, Kazuya suspects it's the song where the Holy Knights beat up delinquents.

100 Delinquents
This is the name of the legendary counting song which has been passed down from the founding of the school, according to Kazuya.

Lyrics

 * 100 delinquents skipped out on cleaning duty!


 * One of them was beat to a pulp, and then there were 99!


 * 99 delinquents ate tempura wakame udon at the cafeteria!


 * One of them was beat to a pulp, and then there were 98!


 * 98 delinquents sniffed lavender in the home-ec classroom after school!


 * One of them was beat to a pulp, and then there were 97!


 * 97 delinquents wrote a love letter to the nurse with the E-cup boobs!


 * One of them was beat to a pulp, and then there were 96!


 * 96 delinquents killed the mood!


 * Five of them were beat to a pulp, and then there were about 91!


 * 91 delinquents snuck into the girls' locker room, put on tendo equipment, and blew into a recorder.


 * 90 delinquents split up and fought among themselves.


 * About 75 of them were beaten to a pulp, and then there were about 9!

Trivia

 * The title of the episode is based off the title of the British novel.
 * The "100 Delinquents" counting song is also based off "10 Little Injuns", the original version of the nursery rhyme Ten Little Indians.
 * The expression that Furuichi mentions in relation to Shimokawa writing "good naito" on the bathroom stall is, a possible allusion to Japanese professional boxer Daisuke Naito.
 * When Takeshi Shiroyama was incapacitated and then left naked in the nurse’s office with the love letter according to the song, Chiaki remarks "That's a big love letter..." implying she was possibly referencing to Shiroyama's penis.
 * In the Animax version of the scene when Takeshi Shiroyama was incapacitated and then left naked in the nurses office with the love letter according to the song, Chiaki remarks "That's a big font...."