S01E01 6 Oct 24

24m

I HATE YOU and I LOVE YOU

Puniru follows Kotaro to school to take him something he forgot, but they end up getting into a fight. Puniru turns into an idol to get Kotaro to admit she’s cute. Kotaro tries to enlist Puniru’s help in winning the affections of his crush, Kirara-senpai.

S01E02 13 Oct 24

24m

Neither Friend nor Slime

Kotaro asks Puniru to turn into a first grader and act lost so he can look good in front of Kirara-senpai, but little does he know Kirara’s maternal instincts go into overdrive around children. Puniru later plays a trick using this knowledge.

S01E03 20 Oct 24

24m

Kawaii Puniru is a Slime

Kotaro’s favorite plushie as a child was the adorable Kyuthi-chan, which had a profound (jealous) effect on Puniru. Now he wants to go to the Kyuthi Café, where he gets Puniru to pretend to be his girlfriend so he can order a dish meant for couples.

S01E04 27 Oct 24

24m

Alice in Kyuthi Land

Alice, granddaughter to the president of the toy company that made Kyuthi-chan, challenges Puniru to see whether she or a character Alice created is more adorable—and you could say the competition gets blown into gigantic proportions!

S01E05 3 Nov 24

24m

GO! GO! Fabulous Cheer Routine!

In an attempt to please Alice, Hodai dons a Runrune costume. Meanwhile, Nanpa, Puniru, and Hone-chan fight over Robo Runrune. Then, to put some pep back in the exhausted Kirara-senpai’s step, Puniru and Runrune become cheerleaders.

S01E06 10 Nov 24

24m

The Runrune-tastic Grand Prix, Now with Puniru!

Puniru gets moldy and down in the dumps when Runrune starts ignoring her. Later, she’s determined to get Runrune and Alice to be friends again. Next, AI Runrune hits the scene, and Alice and Puniru face off to see which Runrune is better.

S01E07 17 Nov 24

24m

Sweet Bitter Summer

Kotaro and the boys go to the beach for a day of fun while Puniru and Kirara-senpai are at the school pool. Later, Kotaro asks Puniru to help him cool off with a special transformation, the gang hits a café, and then it’s time to tackle summer homework.

S01E08 24 Nov 24

24m

Gather 'Round for the School Festival!

It’s time for the school festival, but Puniru and Alice get into a fight over Kotaro. Alice tries to win him over with an incredible offer, and Puniru tries to throw the match so he can pursue his dreams.

S01E09 1 Dec 24

24m

Let's Start a Band, Punks!

Kotaro wants to be cool and decides to try his luck with dragons and a rock band. Puniru then lets the cat out of the bag about Kotaro’s feelings for Kirara, which forces him to make a move. Can he get Puniru to help him out?

S01E10 8 Dec 24

24m

Merry Punirumas!

Ever since being teased as kid for liking cute things, Kotaro has never enjoyed Christmas. This year his parents are going on a trip for the holiday, so in order to avoid being stuck home alone with Puniru, he tries to throw a Christmas party.

S01E11 15 Dec 24

24m

Scoop Up a Spoonful of Christmas

Puniru says she’ll spend the holiday with whoever brings her the cutest Christmas cake, but the offerings she gets are... interesting. When a certain someone loses their patience, she may yet get a Christmas to remember.

S01E12 22 Dec 24

24m

A Lovely, Puniful Destination

Out of the blue, Kotaro wins tickets to a ski resort—specifically the Runrune Resort run by Alice. When they get there, Puniru is determined to make an impression, and her desire to be cuter than ever may just spur even greater adventure.

S01E13 6 Jul 25

24m

Puniru Returns

While hoping for Puniru's return, a lonely Kotaro sees the fruits of her cuteness training from afar. One day, he receives an unexpected package.

S01E14 13 Jul 25

24m

Going on a Journey with My Childhood Friend Slime in Another World. And Valentine's, Too!

Finding himself transported to a fantasy world, Kotaro learns he must rescue Princess Kyuthi, who has been imprisoned in the Demon Lord's castle.

S01E15 20 Jul 25

24m

Rune Rune Dance

After Runru breaks down, Puniru decides to inject it with some slime-based medicine that has an unexpected side effect: awakening its sense of self.

S01E16 27 Jul 25

24m

A Being More Perfect than a Toy

Mado succeeds in creating an artificial slime lifeform and names her Gelee. Wanting to become more human, Gelee begins searching for someone to love.

S01E17 3 Aug 25

24m

Puniru Powers Up?! See It for Yourself!

Kotaro has big plans for the summer, but could he be his own worst enemy? Meanwhile, Puniru seeks to power up.

S01E18 10 Aug 25

24m

A Human Happy Ending

Gelee becomes the center of attention among the school's boys, including Kotaro, much to Puniru's chagrin.

S01E19 17 Aug 25

24m

A Midsummer's Runrune Resort

Alice invites Kotaro to stay at Runrune Resort, but all Kotaro can think about is Gelee and her advances.

S01E20 24 Aug 25

24m

Trick or Kawaii!

Gelee joins Kotaro's class as a student, to her chagrin. Meanwhile, Puniru plans a big surprise for Halloween.

S01E21 31 Aug 25

24m

Art Is All About "Kawaii"!

Hodai hatches a scheme to discredit Kotaro in Alice's eyes by having him face Nanpa in an artistic face-off.

S01E22 7 Sep 25

24m

Friendly Enough to Always Argue

Kotaro gets into a big fight with Puniru, who runs away to Mami's apartment and meets the Kirara family.

S01E23 14 Sep 25

24m

The Human Condition

Kotaro holds a study group with friends, but his careless remark to Gelee ends up having dire consequences.

S01E24 21 Sep 25

24m

That's What the World Calls Love

Puniru turns into a perfect human girl, but Kotaro doesn't seem as happy to hear the news as everyone else.