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I've Been Killing Slimes for 300 Years and Maxed Out My Level S2E10 — We Went to the Demon King's Birthday Party

7.0

I've Been Killing Slimes for 300 Years and Maxed Out My Level•Season 2•Episode 10

We Went to the Demon King's Birthday Party

7.0/10 · 48 votesJun 7, 202524 min

Ranked #11 of 12 in Season 2•−0.2 vs season avg

Discussion

Pecora hosts a grand birthday party, but the only gift she wants is a day alone with Azusa.

Previous episodeE9 · We Met the Evil Spirit Queen Next episodeE11 · I Battled a Traditional Goddess

Seasons2

All 1 2

Season 2 Episodes12

E1 7.3

Along Came a Goddess

E2 7.1

We Searched for an Undead

E3 7.1

We Went to Beelzebub's House

E4 7.6

We Went Looking for a Mandragora

E5 7.1

I Became Mama Yufufu's Daughter

E6 7.3

Laika Entered a Martial Arts Tournament

E7 6.9

I Met a Pine Spirit

E8 7.5

We Went Swimming in the Sea

E9 7.1

We Met the Evil Spirit Queen

E10 7.0Now viewing

We Went to the Demon King's Birthday Party

E11 7.4

I Battled a Traditional Goddess

E12 7.4

We Opened the Coffee Shop Again This Year

Cast9

Aoi Yuki

Azusa (voice)

Kaede Hondo

Laika (voice)

Sayaka Senbongi

Falfa (voice)

Minami Tanaka

Shalsha (voice)

Sayaka Harada

Halkara (voice)

Manami Numakura

Beelzebub (voice)

Riho Sugiyama

Rosary (voice)

Azumi Waki

Fratorte (voice)

Yukari Tamura

Pecora (voice)

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Episode Summary

"We Went to the Demon King's Birthday Party" is episode 10 of I've Been Killing Slimes for 300 Years and Maxed Out My Level season 2. It scored 7.0/10 from 48 votes, ranking #11 of 12 episodes this season (season average 7.2). It aired on June 7, 2025.

Next: E11 · I Battled a Traditional Goddess Best of Season 2