Season 2

2025 · 26 episodes · 5h 38m in all

The seven mermaid princesses, along with their new human friends including Leo's senior student named Gray, fight against Black Diamond, who has returned stronger than ever. Can Purple protect the ocean world, humans, and the land without her own Bubble Gem?

1. Back to School
8 Apr 2025 · 13 min
Peace has returned to the underwater world, and the princesses head back to school. Purple is shocked to find out that Leo has been keeping in touch with the other princesses during the break— but not with her. Confused and hurt by Leo's cold attitude, Purple sees that he's now spending more time with Gray, a second grader at school. Feeling left out, she leaves her princess dictionary behind and runs off to the beach alone.
2. My Very Own Princess Diary
8 Apr 2025 · 13 min
3. The Answer to the Quiz Contest
8 Apr 2025 · 13 min
4. Invitation of Seahorse Kingdom
8 Apr 2025 · 13 min
5. The Uninvited Guest
12 Apr 2025 · 13 min
6. Catch Me If You Can
12 Apr 2025 · 13 min
7. A Secret That Can't Be Told
19 Apr 2025 · 13 min
The other princesses still concerns about why Indigo never shows up until they learn that Indigo is at the Abyssal Kingdom learning that the blobs are still alive until Pale appears to make the other princesses break up with each other.
8. The Truth in the Shadows
19 Apr 2025 · 13 min
Purple and Indigo, who are growing increasingly misunderstood because they don't trust each other, gradually come to know each other's true feelings as they go to the secret temple...
9. Yell-NO
24 Apr 2025 · 13 min
Yellow has a timid personality and finds it difficult to say no. She tries to avoid awkward situations by creating a clone of herself...
10. The Secret Door
26 Apr 2025 · 13 min
Purple refuses to go home because her test scores are bad! Then she gets attacked by Black Diamond's subordinates..
11. Decorating the Hallways!
1 May 2025 · 13 min
Hearing that they'll receive volunteer points, Gray and Green recommend decorating the hallway to the princesses. Blue and Red decorate it however they want, placing a red carpet on one side and exercise equipment on the other. Meanwhile, Black Diamond creates a new Black Curse, her most powerful subordinate, Dark. After obtaining Green's Bubble Gem, Dark lifts Blue Dot School into the sky and turns it into a maze. The school, already complicated by the red carpet and exercise equipment in the hallway, becomes even more confusing, and Indigo, who had been suspicious of Gray from the beginning, confronts Gray.
12. Into the Chaotic Maze
3 May 2025 · 13 min
The princesses must escape the school that is as tangled as a maze. Meanwhile, Indigo, who suspects Gray, ends up fighting with Purple...
13. Unscientific Secret
8 May 2025 · 13 min
Mr. Snivel, who has been suspicious of Purple due to the strange things that have been happening at school, secretly follows Purple and ends up witnessing the princesses' true identity!
14. The Blue Dot Island Parade
10 May 2025 · 13 min
The princesses participate in the parade. However, Black Diamond, who denies the legend of mermaids and humans, attacks them...
15. The True Mermaid Legend
15 May 2025 · 13 min
16. Moon Festival Mayhem
17 May 2025 · 13 min
17. A Duel at the Jellyfish Kingdom
22 May 2025 · 13 min
Purple heads to the Jellyfish Kingdom to find a scroll about the ancient kingdom. She plans to trick King Blue King.
18. The Secret Lies Down Below
24 May 2025 · 13 min
19. Episode 19
29 May 2025 · 13 min
20. Episode 20
31 May 2025 · 13 min
21. Episode 21
5 Jun 2025 · 13 min
22. Episode 22
7 Jun 2025 · 13 min
23. Episode 23
12 Jun 2025 · 13 min
24. Episode 24
14 Jun 2025 · 13 min
25. Episode 25
19 Jun 2025 · 13 min
26. Episode 26
21 Jun 2025 · 13 min