Azusa eats an odd mushroom in the eleventh episode of I’ve Been Killing Slimes for 300 Years and Maxed Out My Level, resulting in her having to climb the World Tree to find something that can counteract its effects.
Mushroom party!
This episode adapts two chapters from the fourth volume of the light novel series: “I Ate a Mushroom and Turned into a Kid”, and “We Went to the Top of the World Tree”.
These events actually happen before Kuku’s introduction in the light novel.
In this episode, Azusa eats a mushroom that turns her into a kid, and ends up climbing the World Tree to find something that can turn her back to normal.
Azusa turned into a kid
This episode cuts a bit of fluff from the start of the chapter in the light novel, starting immediately with the mushroom party. What doesn’t change, though, is Azusa’s sudden transformation, and everyone doting on her.
Beelzebub cannot resist Azusa’s cute new form
Whilst Azusa does summon Beelzebub in both versions, in the light novel the demon doesn’t show up immediately. That leads to Azusa worrying that her magic might not be as powerful in her smaller body, but turns out Beelzebub was just enjoying a hot bath. They only conveyed half the joke in the anime, which I felt was a bit of a shame.
Pecora’s reaction to kid Azusa is not a surprise
The trip to the Demon Lands is in line with the light novel, and yes, Falfa and Shalsha join Azusa and Beelzebub there as well. Azusa hopes to avoid Pecora, too, but naturally that was never going to happen. But, hey, at least Pecora does have some useful information for Azusa… maybe.
Fatla and Vania join Azusa to climb the World Tree
After talking with Pecora, Azusa’s objective becomes the top of the World Tree. She is joined by Fatla and Vania, giving us something of an unusual group. It’s nice to see Fatla and Vania together, when usually one would be in leviathan form before now.
The climb up the World Tree we see in the anime is pretty much on point with the light novel. The lifts, the tame animals, and the hostile creatures on the upper floors; all present and accounted for.
The only thing the anime doesn’t really mention is how Azusa’s group’s funds are dwindling as they get higher and higher up the World Tree.
A sweet moment towards the top of the World Tree
As Azusa and company draw closer to the top of the World Tree, we get a genuinely sweet moment between the leviathan sisters. I’m glad that this series of events was chosen to be adapted; it will allow people to develop a little more appreciation for Fatla and Vania.
Oops, looks like Azusa should’ve taken precautions before returning back to normal…
Turns out things go exactly as Pecora planned, and she gets some Witch of the Highlands fanservice. Then everyone gets into a bath together, because Azusa says so. Same thing happens in the light novel, and yes, Pecora desires the same thing in both versions.
Another fun episode of I’ve Been Killing Slimes for 300 Years and Maxed Out My Level. I’ve probably said that about all of them at this point, but, hey, it’s true. Kid Azusa is cute, and Fatla and Vania get some nice screentime.
Looks like the next episode will be the final one, so expect a review next week. Got my fingers crossed for a second season, though.
Rory Muses 
I think the only thing they didn’t capture the best is how much Azusa felt cheated with the dungeon, but the rest was great, and the whole episode was fantastic~
Pecora may be “innocent”, but she’s looking to fix that XD
I wonder what we’ll be in for in the finale?
The leviathan twins’ bonding time was wonderful, as was the sexy medic, return of Eno and the obvious “Why didn’t you take the shortcut?” joke. Can’t forget honi Pecora and Azusa’s clothes being too tight.