♪♡ Kaykay's Age Regression Ruikasa Fics ♡♪
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Listing Series
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Too Busy To Be Okay by M1kuD4y0
Fandoms: プロジェクトセカイ カラフルステージ！| Project SEKAI COLORFUL STAGE! (Video Game)
04 Feb 2024
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Summary
Tsukasa has been extremely busy! With that comes stress. Too much stress. He’s been pushing aside the fact he needs to regress, but he can’t take it anymore. With that being said, a small incident pushes him over the edge. Rui is here to help~!
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I'm Here For You by M1kuD4y0
Fandoms: プロジェクトセカイ カラフルステージ！| Project SEKAI COLORFUL STAGE! (Video Game)
08 Feb 2024
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Summary
When Tsukasa accidentally regresses at school, he takes the risk of someone seeing the future star in such a state! Luckily, the first person to come to the rooftop is Rui. He’s not sure what is happening to Tsukasa, but he wants to help. This, however, leads to a conversation between the two.
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Weird feelings by M1kuD4y0
Fandoms: プロジェクトセカイ カラフルステージ！| Project SEKAI COLORFUL STAGE! (Video Game)
24 Feb 2024
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Summary
Tsukasa is invited to Rui’s house. Normally he’d be bouncing off-the-walls-excited. Today was… different. He couldn’t place his finger on what he was feeling. It’s familiar, but also not?
To put it short,
Watch tsukasa tenma neglect his needs to regress and break suddenly while he's sleeeeppppyyyy🔥🔥🔥
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Secrets Well(?) Kept! by M1kuD4y0
Fandoms: プロジェクトセカイ カラフルステージ！| Project SEKAI COLORFUL STAGE! (Video Game)
06 Mar 2024
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Summary
Tsukasa is so excited about a new show!!! However, this overwhelming feeling is a little too much... He slips into little headspace during practice. Watch as Rui *attempts* to keep this secret from Emu and Nene(with much struggle) and get his little future star home!
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Tsukasa regressing at practice and Rui tries to get this little dude home but he's a lil too silly!!
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When you need a little reassurance, I'll be there by M1kuD4y0
Fandoms: プロジェクトセカイ カラフルステージ！| Project SEKAI COLORFUL STAGE! (Video Game)
22 May 2024
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Summary
Tsukasa looked at the razor. And then himself in the mirror. What is there to live for? Why would anyone want him on the planet? He’s a waste of space. Those are the thoughts circulating in his head. With the new found motivation to hurt himself, he picks up the razor and cuts.
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“Bleck” he says by M1kuD4y0
Fandoms: プロジェクトセカイ カラフルステージ！| Project SEKAI COLORFUL STAGE! (Video Game)
07 Jun 2024
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Poor little Rui doesn’t sleep for a few days and faints backstage! Uh oh!! Seems he's got a fever..
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Lil princess by M1kuD4y0
Fandoms: プロジェクトセカイ カラフルステージ！| Project SEKAI COLORFUL STAGE! (Video Game)
14 Jul 2024
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Summary
Rui was extremely exhausted, so much so that he couldn’t even work on an invention (decided by Tsukasa). Now, since he wasn’t able to work, all he wanted was to snuggle with Tsukasa and maybe, just maybe, have a bottle of milk.. and a pacifier to suck on… what he didn’t plan on was discovering something about himself!
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Ruikasa Agere hcs!! (But I project way too much) by M1kuD4y0
Fandoms: プロジェクトセカイ カラフルステージ！| Project SEKAI COLORFUL STAGE! (Video Game)
17 Jul 2024
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Candies and carrots!! by M1kuD4y0
Fandoms: プロジェクトセカイ カラフルステージ！| Project SEKAI COLORFUL STAGE! (Video Game)
08 Sep 2024
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Summary
Tsukasa promised his troupe he wouldn't regress, he could be a big boy for the show!! (He was wrong.)
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Trick or Treat! by M1kuD4y0
Fandoms: プロジェクトセカイ カラフルステージ！| Project SEKAI COLORFUL STAGE! (Video Game)
31 Oct 2024
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Summary
Rui was super excited for Halloween! Him and Tsukasa were gonna go trick or treating together! But something about it makes him feel... Little.
Series
- Part 10 of ♪♡ Kaykay's Age Regression Ruikasa Fics ♡♪
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Insecurities by M1kuD4y0
Fandoms: プロジェクトセカイ カラフルステージ！| Project SEKAI COLORFUL STAGE! (Video Game)
21 Oct 2024
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Summary
For a brand new role Tsukasa is auditioning for, one of the requirements is to be thin. Unfortunately, Tsukasa doesn’t think he’s ‘thin’ enough.
Series
- Part 11 of ♪♡ Kaykay's Age Regression Ruikasa Fics ♡♪
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B-but Santa’s Coming!! by M1kuD4y0
Fandoms: プロジェクトセカイ カラフルステージ！| Project SEKAI COLORFUL STAGE! (Video Game)
24 Dec 2024
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Summary
Getting Tsukasa to sleep is usually such an easy task! He’s very good at making sure he goes to bed at a decent hour.. but… tonight’s Christmas Eve…
Series
- Part 12 of ♪♡ Kaykay's Age Regression Ruikasa Fics ♡♪
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Preparing Gifts by M1kuD4y0
Fandoms: プロジェクトセカイ カラフルステージ！| Project SEKAI COLORFUL STAGE! (Video Game)
26 Dec 2024
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Summary
Rui was in the middle of making gifts for his dear friends last minute, when he regressed. All hope was almost lost, but then he got the brilliant idea to call his boyfriend for help! Maybe he'll be able to finish his gifts now?
Series
- Part 13 of ♪♡ Kaykay's Age Regression Ruikasa Fics ♡♪
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Maybe another helping hand isn't too bad by M1kuD4y0
Fandoms: プロジェクトセカイ カラフルステージ！| Project SEKAI COLORFUL STAGE! (Video Game)
28 May 2025
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Summary
Tsukasa has had an awful day, and he just wants to go home.
Series
- Part 14 of ♪♡ Kaykay's Age Regression Ruikasa Fics ♡♪
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Operation: Star Baking! by M1kuD4y0
Fandoms: プロジェクトセカイ カラフルステージ！| Project SEKAI COLORFUL STAGE! (Video Game)
08 Jun 2025
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Summary
The sudden urge to bake overtakes a tiny Kasa, who can say no to his adorable face? Rui certainly can't!
Series
- Part 15 of ♪♡ Kaykay's Age Regression Ruikasa Fics ♡♪
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Time to wind down by M1kuD4y0
Fandoms: プロジェクトセカイ カラフルステージ！| Project SEKAI COLORFUL STAGE! (Video Game)
09 Jun 2025
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Summary
After a long day of playing, it’s naptime.
Series
- Part 16 of ♪♡ Kaykay's Age Regression Ruikasa Fics ♡♪
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Plans Cancelled by M1kuD4y0
Fandoms: プロジェクトセカイ カラフルステージ！| Project SEKAI COLORFUL STAGE! (Video Game)
01 Sep 2025
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Summary
Rui was supposed to take Tsukasa out on a date, but someone feels a bit fuzzy..
Series
- Part 17 of ♪♡ Kaykay's Age Regression Ruikasa Fics ♡♪
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Writing a Letter to Santa by M1kuD4y0
Fandoms: プロジェクトセカイ カラフルステージ！| Project SEKAI COLORFUL STAGE! (Video Game)
25 Dec 2025
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Summary
Tsukasa finally gets to wind down, why not spend this time to tell Santa what he wants!
Series
- Part 18 of ♪♡ Kaykay's Age Regression Ruikasa Fics ♡♪