Ep. 41: Maki proposes marriage to Nikora while Lucia, Hanon, and Rina attempt to intervene.
Aired on January 10, 2004

41
Maki, who owns the beach house, formally asks Nikora for her hand in marriage. Nikora accepts the proposal, leading Lucia, Hanon, and Rina to attempt to stop the union. The trio intervenes because they are aware that Nikora is also a mermaid, a fact that complicates the situation. Their efforts to prevent the marriage stem from this shared identity, creating tension as the engagement proceeds despite their objections. The episode focuses on the conflict between the proposal and the group's knowledge of Nikora's true nature.
Episodes
- Ep. 37 · The trio investigates a rumor about mermaid beads linked to a human marriage
- Ep. 38 · Lucia receives a dare from a woman who turns out to be Kaito's aunt.
- Ep. 39 · Lucia, Hanon, and Rina argue over melon pudding before a New Year's concert.
- Ep. 40 · Lucia, Hanon, and Rina experience a bizarre dream about pursuing careers in the entertainment industry
- Ep. 41 · Maki proposes marriage to Nikora while Lucia, Hanon, and Rina attempt to intervene.
- Ep. 42 · Hippo and Yūri are separated after being caught by Lucia, Hanon, and Rina.
- Ep. 43 · Three dim-witted men hired by Black Beauty Sisters pursue the Mermaid Princesses while Taro meets Sara.
- Ep. 44 · Snowstorm cancels skiing trip and causes Lucia to disappear
- Ep. 45 · Lucia notices Kaito's lingering thoughts about his mermaid during their date outing.