Mermaid Line by Kindaichi Renjuurou — Completed

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"Megumi and Aoi," a three-part story, is about a girl who says she's a mermaid princess.
In "Girl*Girl," an extra story in the "Megumi and Aoi" Mermaid Line series, Aoi contemplates what things would be like if she or Megumi were guys.
In "Yukari and Mayuko," Yukari starts a pretend relationship with her friend Mayuko after Mayuko's heart gets broken.
In "Ayumi and Aika," a two-part story, Ayumi's boyfriend makes an announcement, but not the one she was hoping for.

Chapter 1: Megumi and Aoi 1 released Dec 30 '08 School life
Chapter 2: Megumi and Aoi 2 released Dec 31 '08 School life
Chapter 3: Megumi and Aoi 3 released Feb 24 '09 School life
Chapter 4: Girl*Girl released Feb 24 '09 School life
Chapter 5: Yukari and Mayuko released Mar 26 '09 Adult life Het NSFW
Chapter 6: Ayumi and Aika 1 released Jun 5 '09 Adult life Transgender
Chapter 7: Ayumi and Aika 2 released Jun 5 '09 Adult life Transgender