justamethyst3
Fandoms
Recent works
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Let's go Home by justamethyst3
Fandoms: プロジェクトセカイ カラフルステージ！| Project SEKAI COLORFUL STAGE! (Video Game)
20 Jul 2026
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Summary
The tone paused mid-ring once the lines connected, his friend's annoyed voice coming through.
“What do you want?”
“Can you borrow your mom's car and pick me up?”
“... Are you serious right now-?!”
“Tsukasa-kun said he's staying at work late today, and I don’t want to worry him, and it's really cold out and the apartment’s a little far from here, even if I take the subway, and I don't want her to freeze on the way home, and-”
“Rui-... Hold on, ‘her’?”Rui couldn't just leave the pet shop behind. But he'll have to apologize to Tsukasa later...
Series
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From the Waters by justamethyst3
Fandoms: プロジェクトセカイ カラフルステージ！| Project SEKAI COLORFUL STAGE! (Video Game)
10 Apr 2026
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Summary
**Slow updates
Rui Kamishiro. Not the most ordinary jellyfish in the sea, considering his eccentric personality (and not including the fact that he only has half the amount of tentacles any other jellyfish has, and a pair of human person legs).
Though, his life is rather boring, and not to his liking in the slightest bit. A shame there isn't an easy way to make life more exciting... Like, let's say, going to the surface?
Ah, but it's a crazy idea to go up there, and he could be hunted by the human people! Surely, Rui, THE Rui Kamishiro would know better than to put himself in danger like that...
Series
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In the Rain With(out) You by justamethyst3
Fandoms: プロジェクトセカイ カラフルステージ！| Project SEKAI COLORFUL STAGE! (Video Game)
13 Feb 2026
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Summary
How long has it been now, since Rui escaped the apartment? It couldn’t have been more than a few days, but it already felt like an eternity.
And... aside from Mizuki and Nene, and his parents… Rui had no one. No one… except Tsukasa. And Rui despised that fact.He never imagined he'd receive comfort from him of all people...
Series
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Sing Me To Sleep by justamethyst3
Fandoms: プロジェクトセカイ カラフルステージ！| Project SEKAI COLORFUL STAGE! (Video Game)
19 Dec 2025
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Summary
Rui mindlessly tapped on his keyboard, staring at the script he was currently editing on the monitor.
Though, he could barely keep his eyes open while he sat there. And boy, was he exhausted.
~ * ~
Day 7: Free day!!
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Behind the Mask Lies a World Yet Unseen by justamethyst3
Fandoms: プロジェクトセカイ カラフルステージ！| Project SEKAI COLORFUL STAGE! (Video Game)
13 Dec 2025
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Summary
Tsukasa didn’t mind the occasional ball or two, in fact, he enjoyed many of the yearly festivities held within the kingdom.
The masquerade, however, was one he couldn’t ever bring himself to enjoy.
~ * ~
Day 2: Masquerade
Recent series
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Little Kitty (Please Stay With Me)+PuppyKasa by justamethyst3
Fandom プロジェクトセカイ カラフルステージ！| Project SEKAI COLORFUL STAGE! (Video Game)
20 Jul 2026
Summary
**Very VERY slow updates
A little series of short stories for my AU about Tsukasa and Kitty/Catboy Rui (and PuppyKasa)!
I'll be writing them in no specific order, but I'll try to keep them in chronological order as best I can ^_^
- Words:
- 86,421
- Works:
- 14
- Bookmarks:
- 36
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Set Adrift By You | Project Sekai Underwater/Mermaid AU by justamethyst3
Fandom プロジェクトセカイ カラフルステージ！| Project SEKAI COLORFUL STAGE! (Video Game)
10 Apr 2026
Summary
Sea folk and humans. Not a very good mix, if you're to ask anyone about it. Most would be at each other's throats with their hatred for each other. But was it really impossible for them to coexist peacefully? What if, I daresay, one fell for the other?
~ * ~
An AU I built up in about two weeks while stuck in bed and just need to write out and finish designing the characters for lol
Completed:
OverboardIn progress:
Book 1 - From the Waters- Words:
- 57,533
- Works:
- 2
- Bookmarks:
- 3
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12 Days of RuiKasa '23 by justamethyst3
Fandom プロジェクトセカイ カラフルステージ！| Project SEKAI COLORFUL STAGE! (Video Game)
06 Dec 2023
Summary
Day 1-2: AU / Day 3-4: Cats
Day 5-6: Sharing Clothes
Day 7-8: Roommates
Day 11-12: Free day- Words:
- 12,584
- Works:
- 4
- Bookmarks:
- 1
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RuiKasa Week '23 by justamethyst3
Fandom プロジェクトセカイ カラフルステージ！| Project SEKAI COLORFUL STAGE! (Video Game)
18 Jul 2023
Summary
One shots written for RuiKasa week following the prompts on twitter!
~ * ~
This fic series is cross posted on Wattpad under the same username: justamethyst3
That is the only other place this fic should be- Words:
- 33,169
- Works:
- 7
- Bookmarks:
- 1
Recent bookmarks
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The Light, the Dark, and the Gray Spaces in Which We Met by k_katabasis
Fandoms: プロジェクトセカイ カラフルステージ！| Project SEKAI COLORFUL STAGE! (Video Game)
19 Feb 2026
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Summary
Rui's been alone most of his life. After fleeing the Dark Kingdom when war breaks out, he finds a moderate amount of happiness as an alchemist selling his potions and products in the Light Kingdom. Even though Rui doesn't mind his daily routine, he can't help but feel like he's missing something...
summaries are hard and I don't want to spoil my whole plot for Tsukasa so I'm sorry its short and vague :((
Edit: I know the first few chapters are pretty short, which is a turn off for some readers (myself included, I'm very picky) but I was learning back then. I considered merging some of the earlier chapters, but this would require me to delete at least half the original chapter pages, which would delete the associated comments and I couldn't bear to do that. I ask that you stick with the fic, as the chapters get more than 3x as long by chapter 7. Thanks so much for the support so far!
Edit 2: I have redone Mizuki's pronouns from ch 11 to be she/her and changed the fic tags accordingly. In 2023 or so when i wrote that chapter, they/them was more widely used, even though I personally preferred she/her for her.
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Tags
Summary
In an attempt to ease tensions between Hoshido and Nohr, a marriage is arranged between Princess Kamui of Hoshido and Prince Leo of Nohr. Their parents believe it will work out, but Kamui and Leo have their doubts.
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Snowball effect by Law_EvadingRock
Fandoms: プロジェクトセカイ カラフルステージ！| Project SEKAI COLORFUL STAGE! (Video Game)
30 Apr 2025
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Summary
“Hm?” Emu hummed excitedly, “Rui-kun, Rui-kun! What’s in the bag?” Her mouth was open with intrigue as she eyed him as he lifted it up and presented it proudly.
He grinned, “I bought some pastries just now. I thought we could use the treats.” He supplies.
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muscle memory by cliyxu
Fandoms: プロジェクトセカイ カラフルステージ！| Project SEKAI COLORFUL STAGE! (Video Game)
15 Mar 2025
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Summary
tsukasa, still standing, only sighs with eyes softened by fondness and leans downwards, and neither of them really thinks before it happens.
just as rui lightly lifts his chin, tsukasa gently rests a hand on his cheek, then dips down to kiss his cheek. there’s a collective gasp around the entire rooftop. confused, rui’s eyes open to see emu’s pink ones staring back, wide.
tsukasa looks around. at the reaction, rui too, straightens up so quickly that his forehead bumps into tsukasa’s mouth. in tandem, tsukasa steps back, shocked, blinking and holding his mouth while grumbling to himself. neither emu or nene are sure if it’s because of the minor collision, or because of their careless little moment of affection driven by pure muscle memory.
either way, their secret is out now.
ㆍ┈┈ㆍ┈┈ㆍ┈┈ㆍ┈┈ㆍ
the horror tsukasa faces when a habitual act of affection ends up revealing their relationship to the whole school — yet rui doesn’t even seem to mind in the slightest!
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Laugh out loud by Law_EvadingRock
Fandoms: プロジェクトセカイ カラフルステージ！| Project SEKAI COLORFUL STAGE! (Video Game)
27 Feb 2025
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Summary
Listening as Rui chuckled a few feet away from him, Tsukasa realizes that he’s never heard Rui laugh.
“But Tsukasa-kun!!” He can already hear Emu cry, “Rui-kun laughs all the time!”
To which he tells imaginary scenario Emu, “Chuckle, yes! A laugh, from the chest? No!”
—
Tsukasa’s been thinking about Rui, and the fact he doesn’t laugh too often.