Dolphin Rider Koishi

Everything About Fiction You Never Wanted to Know.

A finished Web Serial Novel which follows alternate versions of Touhou characters in a Magical Girl Warrior story. It's better than it sounds, with well-expressed characters and creative reinterpretations of Canon and Fanon elements. The complete version can be read here, with a less complete version readable on Fanfiction.net.

In the coastal Japanese city of Gensoutou, Ordinary High School Student Koishi Komeiji has been living alone for the last few months (apart from her pet cat and raven) since her sister Satori vanished without a trace. Bullied and lonely, when she hears a rumour about an abandoned shrine that grants wishes, she begs for someone strong and brave to look after her. Instead a strange jewel materialises out of thin air, and she's attacked by Fish People only to be saved by a talking dolphin. The dolphin tells Koishi to squeeze the jewel, and she defeats the fishmen by transforming into the "Siren" Dolphin Rider Koishi. Back at her apartment the now-human dolphin explains that she is a youkai, and a junior member of a human-protecting organisation called the Order of the White Pearl. Koishi and the dolphin (named Sango) must find the remaining six Sirens before the White Pearl's enemies, the Children of the Black Claw, can use their powers for evil.

Along the way Koishi ends up as a sort of Warrior Therapist, recruiting Sirens and curing Monsters of the Week by forcing them to confront their psychological issues.


See Touhou for tropes carried over from canon.

Tropes used in Dolphin Rider Koishi include:


Mama’s just sleeping Papa didn’t do anything to her

It hurt. It hurt like hell. She didn't care, she just wanted this thought to go away. The more she looked at that face, the less Kaguya looked like a heartless monster, and the more she looked like a stupid girl who made a stupid choice to win over her daddy.

She didn't want Kaguya to have an explanation. Explanations meant she'd need to accept that she had a reason for screwing her over beyond being a heartless bitch, and then she'd have to let the grudge go. But forgiveness was hard, so much harder than just staying angry.

Nitori typed in the name lazily. They had to settle for the family name, Scarlet, mainly because all of them found the name Flandre so foreign they had no clue how to spell it.

"Koishi-san, let me get this straight. You humans have invented a system that lets you cut spare keys to any door. No fuss, no pizazz, no evidence. You’re telling me that you’d rather I had to go through a lockpicking charm every time I wanted to get in here after hours? Jeez, and you say that I’m crazy."

"And what's life like in the real world? Well, imagine everyone you ever knew had some sort of superpower or magical ability. Everyone in your class is some sort of Magical Girl, and they all look like it as well - crazy hair, weird eye colours, and in your case an extra eye on top of the two you've already got. But again, no-one realises it, so all of that magic just goes to waste."

  • "Well Done, Son" Guy: Kaguya's father has very high expectations of her which she struggles to live up to. The Kaguya/Mokou feud actually started when she stole from Mokou to please him, and Kaguya is implied to feel extremely guilty about it.
  • Worthy Opponent: Jozu to Sango.
  • You Can See Me?: Youki Saigyouji
  1. Sakuya meaning "flowering night" and Izayoi meaning "sixteenth night [of the month]"