Season
- Season 1 2011-01-09
- Season 0 2010-10-23
Episode
- Episode 1: I Picked Up the Demon King
- Episode 2: I Became a Gang Leader with a Child
- Episode 3: Are There Any Strong, Ruthless Bastards Around?
- Episode 4: There Is One Second Before the Demon Lord's Floods Burst Forth
- Episode 5: Money can buy anything
- Episode 6: Toys Have Arrived from the Demon World / We Played Doctor
- Episode 7: The Demon Lord makes his Park Debut
- Episode 8: We Meet Again
- Episode 9: Love is a Hurricane
- Episode 10: A Disciple Was Gained
- Episode 11: There was Something Money Could not Buy
- Episode 12: I Won't Let You Sleep Tonight
- Episode 13: Baby Beel's Assessment Test / Hilda: Dear Great Demon Lord
- Episode 14: Is There a Special Move?
- Episode 15: The Delinquents Have Changed Into Swimsuits
- Episode 16: You're Not a Bad Specimen of a Man
- Episode 17: How About Some Demon World Homework?
- Episode 18: I Quit being the Baby on Back Brawler
- Episode 19: The Doctor Has Arrived
- Episode 20: Everyone Assemble
- Episode 21: Who Do You Think Is Ishiyama's Strongest?
- Episode 22: Secluded Mountain Training
- Episode 23: You Kidding Me? The Demon World
- Episode 24: Welcome Back, Demon World!
- Episode 25: New Semester Started
- Episode 26: May I Call You Brother?
- Episode 27: Called the Magical Girl
- Episode 28: Let's All Get Physicals
- Episode 29: What Are the 6 Holy Knights?
- Episode 30: Who Could the 6 Holy Knights Be?
- Episode 31: No Conclusion Was Reached!
- Episode 32: What Has the Transfer Girl Done?
- Episode 33: There Are Wounds in the Past
- Episode 34: Maids Run Amok
- Episode 35: Time for the Game to Begin!
- Episode 36: The Victory has Finally Arrived
- Episode 37: This Man is a Teacher
- Episode 38: The Sibling Rivalry Has Begun
- Episode 39: His Brother Was a Crybaby
- Episode 40: No Shirt, No Shoes, No Assassins
- Episode 41: On the Brink! What'll We Do?
- Episode 42: It's Time to Train
- Episode 43: Where Did the Older Brother Disappear To?
- Episode 44: I Have to Get Stronger
- Episode 45: There's One Day and 1 Hour Left Until the Game
- Episode 46: Burn, Super Combination!
- Episode 47: Sorry to Have Kept You Waiting
- Episode 48: I'm His Parent
- Episode 49: Beelzebub's New Year's Special! Beelbeel Journey to the West!
- Episode 50: Today I'm Different on the Inside
- Episode 51: Komainu-sama is Watching You
- Episode 52: And Then There Were No Delinquents
- Episode 53: Baby Beel's First Conquest / Furuichi Falls in Love
- Episode 54: Black Baby Beel Grows Up!
- Episode 55: I Have Lost My Pompadour / The Great Demon Lord Has Come
- Episode 56: Are You a Traitor? / Is This a Job for Men?
- Episode 57: Won't You Eat a Manju? / Won't You Get in a Mixed Bath?
- Episode 58: Akumano Academy is Open!
- Episode 59: We're the Strongest!
- Episode 60: I Won't Say Goodbye
Beelzebub
Violent delinquent Oga encounters a baby one day, which crawls onto his back and immediately forms an attachment to him. Though he doesn't know it yet, this baby is named Kaiser de Emperana Beelzebub IV, or "Baby Beel" for short—the son of the Demon Lord!
