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!
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| Title | Air Date | Duration | ||
|---|---|---|---|---|
| Season 1 | Episode 1 | I Picked Up The Devil King | 2011-01-09 | 22 min |
| Season 1 | Episode 2 | I Became a Gang Leader with a Child | 2011-01-16 | 22 min |
| Season 1 | Episode 3 | Are There Any Strong, Ruthless Bastards Around Here? | 2011-01-23 | 22 min |
| Season 1 | Episode 4 | There Is One Second Before the Demon Lord's Floods Burst Forth | 2011-01-30 | 22 min |
| Season 1 | Episode 5 | There's Nothing You Can't Buy With Money | 2011-02-06 | 22 min |
| Season 1 | Episode 6 | Toys Have Arrived from the Demon World / We Played Doctor | 2011-02-13 | 22 min |
| Season 1 | Episode 7 | The Demon Lord makes his Debut at the Park | 2011-02-20 | 22 min |
| Season 1 | Episode 8 | We Meet Again | 2011-02-27 | 22 min |
| Season 1 | Episode 9 | Love is a Hurricane | 2011-03-06 | 22 min |
| Season 1 | Episode 10 | A Disciple Was Gained | 2011-03-27 | 22 min |
| Season 1 | Episode 11 | There Was Something Money Couldn't Buy | 2011-04-03 | 22 min |
| Season 1 | Episode 12 | I Won't Let You Sleep Tonight | 2011-04-10 | 22 min |
| Season 1 | Episode 13 | Baby Beel's Assessment Test / Hilda: Dear Great Demon Lord | 2011-04-17 | 22 min |
| Season 1 | Episode 14 | Is There a Special Move? | 2011-04-24 | 22 min |
| Season 1 | Episode 15 | The Delinquents Have Changed Into Swimsuits | 2011-05-01 | 22 min |
| Season 1 | Episode 16 | You're Not a Bad Specimen of a Man | 2011-05-08 | 22 min |
| Season 1 | Episode 17 | How About Some Demon World Homework? | 2011-05-15 | 22 min |
| Season 1 | Episode 18 | I've Quit Being the BoB Brawler! | 2011-05-22 | 22 min |
| Season 1 | Episode 19 | The Doctor Has Arrived | 2011-05-29 | 22 min |
| Season 1 | Episode 20 | Everyone Assemble | 2011-06-05 | 22 min |
| Season 1 | Episode 21 | Who Do You Think Is Ishiyama's Strongest? | 2011-06-12 | 22 min |
| Season 1 | Episode 22 | Secluded Mountain Training | 2011-06-19 | 22 min |
| Season 1 | Episode 23 | You Kidding Me? The Demon World | 2011-06-26 | 22 min |
| Season 1 | Episode 24 | Welcome Back, Demon World! | 2011-07-03 | 22 min |
| Season 1 | Episode 25 | The New Term Has Started | 2011-07-10 | 22 min |
| Season 1 | Episode 26 | May I Call You Brother? | 2011-07-17 | 22 min |
| Season 1 | Episode 27 | Called the Magical Girl | 2011-07-24 | 22 min |
| Season 1 | Episode 28 | Let's All Get Physicals | 2011-07-31 | 22 min |
| Season 1 | Episode 29 | What Are the 6 Holy Knights? | 2011-08-07 | 22 min |
| Season 1 | Episode 30 | Who are the Six Holy Knights? | 2011-08-14 | 22 min |
| Season 1 | Episode 31 | No Conclusion Was Reached! | 2011-08-28 | 22 min |
| Season 1 | Episode 32 | What Has the Transfer Girl Done? | 2011-09-04 | 22 min |
| Season 1 | Episode 33 | There Are Wounds in the Past | 2011-09-11 | 22 min |
| Season 1 | Episode 34 | Maids Run Amok | 2011-09-18 | 22 min |
| Season 1 | Episode 35 | Time for the Game to Begin! | 2011-09-25 | 22 min |
| Season 1 | Episode 36 | Finally, the Deciding Battle! | 2011-10-02 | 22 min |
| Season 1 | Episode 37 | That Man Was a Teacher! | 2011-10-09 | 22 min |
| Season 1 | Episode 38 | The Sibling Rivalry Has Begun | 2011-10-15 | 22 min |
| Season 1 | Episode 39 | His Brother Was a Crybaby | 2011-10-22 | 22 min |
| Season 1 | Episode 40 | No Shirt, No Shoes, No Assassins | 2011-10-29 | 22 min |
| Season 1 | Episode 41 | On the Brink! What'll We Do? | 2011-11-05 | 22 min |
| Season 1 | Episode 42 | It's Time for Training! | 2011-11-12 | 22 min |
| Season 1 | Episode 43 | Where Might My Brother Have Disappeared to? | 2011-11-20 | 22 min |
| Season 1 | Episode 44 | I Must Become Stronger | 2011-11-27 | 22 min |
| Season 1 | Episode 45 | Play Games at Most One Hour a Day | 2011-12-04 | 22 min |
| Season 1 | Episode 46 | Super Burning Combination | 2011-12-11 | 22 min |
| Season 1 | Episode 47 | Sorry to Have Kept You Waiting | 2011-12-18 | 22 min |
| Season 1 | Episode 48 | I am the Parent! | 2011-12-25 | 22 min |
| Season 1 | Episode 49 | Beelzebub's New Year's Special! Beelbeel Journey to the West! | 2012-01-08 | 22 min |
| Season 1 | Episode 50 | Today I'm Different on the Inside | 2012-01-15 | 22 min |
| Season 1 | Episode 51 | Komainu-sama is Watching You | 2012-01-22 | 22 min |
| Season 1 | Episode 52 | And Then There Were No Delinquents | 2012-01-29 | 22 min |
| Season 1 | Episode 53 | Baby Beel's First Conquest / Furuichi Falls in Love | 2012-02-05 | 22 min |
| Season 1 | Episode 54 | Black Baby Beel Grows Up! | 2012-02-12 | 22 min |
| Season 1 | Episode 55 | I Have Lost My Pompadour / The Great Demon Lord Has Come | 2012-02-19 | 22 min |
| Season 1 | Episode 56 | Are You a Traitor? / Is This a Job for Men? | 2012-02-26 | 22 min |
| Season 1 | Episode 57 | Won't You Eat a Manju? / Won't You Get in a Mixed Bath? | 2012-03-04 | 22 min |
| Season 1 | Episode 58 | Akumano Academy is Open! | 2012-03-11 | 22 min |
| Season 1 | Episode 59 | We're the Strongest! | 2012-03-18 | 22 min |
| Season 1 | Episode 60 | I Won't Say Goodbye | 2012-03-25 | 22 min |
| Directing | Nobuhiro Takamoto | Series Director |
| Writing | Masahiro Yokotani | Series Composition |
| Writing | Ryuuhei Tamura | Comic Book |
| Visual Effects | Tsuyoshi Yoshioka | Character Designer |
| Sound | Tsuyoshi Takahashi | Sound Director |
| Camera | Atsuho Matsumoto | Director of Photography |
| Visual Effects | Keiko Kai | Color Designer |
| Editing | Takeshi Seyama | Editor |
| Art | Toshiyuki Tokuda | Art Direction |
| Art | Junichi Higashi | Art Direction |
| Sound | Yasuharu Takanashi | Original Music Composer |
| Production | Yasuyuki Ōkuma | Supervising Producer |
