Koishi Komeiji

* Koishi Komeiji
* Koishi Yakumo

**Koishi Komeiji** is the main protagonist of *Koishi Komeiji's Heart-Throbbing Adventure*. She is the sister of Satori Komeiji who is driven mad as part of the plot to fulfill the Moonlight Descent Ceremony.

## History

### Past

Koishi and her sister Satori were originally a pair of satoris who wandered the Outside World, taking a cat and dog as their hosts respectively. One day, Koishi came upon a family composed of a woman, a man and their newborn child. She began watching them, only to witness the woman's life fall apart as her husband left her and she drowned her baby. Driven mad by the grisly event, Koishi possessed the dead child, killed the woman, and then possessed the woman's body before going on a rampage.

At the same time, the Lunarian princesses Watatsuki no Toyohime and Watatsuki no Yorihime approached Satori and made a deal with her. They offered her artificial human bodies for her and Koishi to possess in exchange for their help in carrying out the Moonlight Descent Ceremony. After Satori reluctantly agrees, Koishi possesses her body but, after hearing several onlookers call her a freak for the rampage she went on earlier, chose to shut her third eye. Koishi and her sister were then sent to Gensokyo by the Watatsuki sisters in preparation for the plan.

### Life in Gensokyo

In Gensokyo, Koishi lived a mostly peaceful life with her sister until one day she decided to go fishing in the Misty Lake so her and Satori could eat the fish she caught. Needing a fishing rod, Koishi went to the Scarlet Devil Mansion hoping to borrow a fishing rod from them. When Hong Meiling turned her away, Koishi attacked her and injured her neck before proceeding inside. She was then attacked by Flandre Scarlet, who wanted revenge on her for what she did to Meiling, but Koishi was able to summon newfound power due to the Moonlight Descent Plan's effects and beat back Flandre before tearing one of her wings off to use as a fishing rod. Before she could do any more harm to Flandre however, Satori suddenly arrived and told Koishi to stop and to come home with her.

Upon her return to the Palace of Earth Spirits, Koishi was locked in the basement by Satori to keep her from doing any more harm. However, desperate to see her sister again, Koishi broke down the wall to escape. At roughly the same time, the early stages of the Moonlight Descent Ceremony were sent into motion and various Gensokyo residents were driven to become more violent by the moon's rays. Believing Koishi to be the source of the madness, Yukari Yakumo traveled to the Palace of Earth Spirits and killed Koishi by cutting off her arms and limbs. However, Koishi was really a decoy used by Koakuma and Reisen II to draw Yukari into a trap, allowing Reisen II to kill her by using her own shikigami servants as unwilling suicide bombers.

### Merging with Yukari

Despite seeming to have been killed before, Koishi's body arose and began moving using the tendrils of her third eye. She eventually came across a dying Yukari and merged with her, resulting in their consciousnesses sharing the same body, albeit with Koishi as the dominant one. Yukari then directed Koishi to head out to assist Reimu Hakurei in searching for the source of the madness.

They eventually discovered that Koakuma was in a conspiracy with the Lunarians to drive Gensokyo's residents mad and turn them into kaiju, but were unable to stop her from manipulating Flandre into destroying the Great Hakurei Barrier, forcing the kaiju-fied Gensokyo residents out into the Outside World.

### Life in the Outside World

As a side effect of the Great Hakurei Barrier's destruction, Koishi and Yukari were separated into different bodies again and both began living together in the Outside World. After Yukari lashed out at her for her lack of care for what happened to the other residents of Gensokyo, Koishi decided to forcibly reopen her third eye.