Kashiyuka's Mermaid Diving Photos: What the Perfume Star Shared and Why Fans Are Mesmerized

On September 3, 2026, Kashiyuka—one-third of the electro-pop trio Perfume—posted breathtaking underwater photographs to Instagram that left fans comparing her to a mermaid. The images, which show the singer gliding gracefully through blue water, revealed not just a stunning visual moment but also a serious hobby: Kashiyuka has earned her freediving certification and has been pursuing the sport with dedication. Here's everything we know about the photos, her diving journey, and why this glimpse into her off-stage life resonated so deeply with fans.

What the Photos Actually Show

The images Kashiyuka shared aren't casual vacation snapshots—they're the work of someone who has invested time and training into freediving. In the photos, we see her suspended in clear blue water, her body positioned with a dancer's grace, arms extended, hair flowing. The light filters down from above, creating an ethereal glow that immediately brings to mind classic mermaid imagery. Unlike scuba diving, where a diver breathes from a tank, freediving requires holding your breath while underwater, making every movement deliberate and every pose the result of both skill and comfort in the water.

The photos were tagged with #しゅみゆか (shumi-yuka), a hashtag Kashiyuka uses to share her personal hobbies and interests outside of Perfume's demanding performance schedule. This particular tag has become a window for fans into the quieter, more personal pursuits of an artist whose public image is usually tightly choreographed and tech-forward.

Her Freediving Certification and Training

What many fans didn't know until this post is that Kashiyuka has earned her AIDA2 certification in freediving. AIDA International is one of the world's leading freediving organizations, and the AIDA2 level represents a solid foundation in the sport. To earn this certification, divers must demonstrate they can freedive to a depth of 16 meters (about 52 feet), perform a static breath-hold of at least two minutes, and swim 40 meters horizontally underwater on a single breath.

This isn't a weekend hobby—freediving at this level requires proper instruction, safety training, breath control techniques, and physical conditioning. The fact that Kashiyuka pursued and completed this certification shows a commitment that goes well beyond posing for pretty pictures. It also speaks to a broader pattern we've seen among performers who maintain intensely physical careers: many find grounding in individual sports that offer both challenge and solitude, a sharp contrast to the collaborative, high-energy world of live performance.

Why "Mermaid" Became the Universal Response

When fans describe the photos as "mermaid-like," they're responding to more than just the underwater setting. There's a quality of weightlessness and fluidity in the images that mirrors how we imagine mythical sea creatures might move—unhurried, graceful, completely at home in an environment that would challenge most of us. Kashiyuka's background as a trained dancer in Perfume translates beautifully to the water; her body lines are clean, her positioning looks intentional rather than awkward, and there's a performance quality to the images even though they're clearly documentation of a real dive.

The mermaid comparison also taps into something deeper: the fantasy of transformation and escape. For fans who know Kashiyuka primarily through Perfume's futuristic, technology-themed performances—complete with intricate choreography, LED visuals, and synthesized beats—these images of her in a purely natural environment, moving through water lit only by sunlight, feel almost otherworldly in their contrast. It's a reminder that the people we admire on stage have entire lives and passions we never see.

The Timing and Context

Kashiyuka's Instagram post appeared on September 3, 2026, and by September 4 it had been picked up by multiple Japanese entertainment outlets. The coverage continued through September 6, with some outlets publishing follow-up pieces as late as September 8. This kind of sustained media attention for a celebrity hobby post isn't unusual in Japan, where fans and media alike show genuine interest in the off-stage lives of idols and performers—not just their scandals or relationships, but their genuine interests and personal growth.

The post arrived during what appears to be a quieter period in Perfume's public schedule, giving fans a glimpse of how the members spend their time when they're not promoting a release or on tour. For a group that has maintained its core trio lineup since 2000 and built a career on precision and innovation, these personal shares feel especially valuable—they humanize performers whose on-stage personas are often deliberately stylized and futuristic.

What People Are Saying

Fans immediately flooded the comments with reactions that mixed awe and affection. One commenter wrote, "まるで、マーメイド" ("Just like a mermaid"), capturing what became the dominant response to the images. The comparison wasn't just about the setting—it was about the grace and apparent ease Kashiyuka showed underwater, as if she belonged there.

Another fan noted, "海の中でも踊ってるみたい" ("It looks like you're dancing even in the sea"), drawing the connection between her Perfume choreography and the fluid movements captured in the dive photos. This observation resonated with many who recognized that her years of dance training were clearly visible in how she moved through the water.

Multiple commenters used variations of "美しい" (beautiful) and "見惚れてしまいました" ("I was captivated" or "I couldn't look away"). The photos clearly struck a chord not just as celebrity snapshots but as genuinely compelling images—the kind that would be beautiful regardless of who was in them, but gain extra meaning because they reveal an unexpected side of someone fans thought they knew well.

Several fans also expressed surprise and admiration that Kashiyuka had earned a freediving certification, with comments praising her dedication to mastering a new skill rather than just trying it once for the photo opportunity. This distinction mattered to fans who appreciated seeing her commit to something challenging and potentially risky with the same seriousness she brings to her music career.

Frequently Asked Questions

When did Kashiyuka post the underwater photos?

She posted the photos to Instagram on September 3, 2026. The images were picked up by Japanese entertainment media starting September 4 and continued to circulate through at least September 8.

What kind of diving is Kashiyuka doing in the photos?

She's freediving, which means diving underwater while holding your breath, without the use of scuba equipment or breathing apparatus. She has earned her AIDA2 certification, an internationally recognized freediving qualification that requires specific depth, breath-hold, and distance achievements.

Where can I see the original photos?

The photos were posted to Kashiyuka's official Instagram account. She tagged the post with #しゅみゆか, the hashtag she uses for sharing her personal hobbies and interests.

Is freediving dangerous?

Like any underwater activity, freediving carries risks, which is why proper certification and training—like the AIDA2 course Kashiyuka completed—are essential. Certified freedivers learn breath-hold techniques, equalization methods, safety protocols, and always dive with proper supervision. When practiced with training and appropriate safety measures, it's a recognized sport enjoyed worldwide.

Has Kashiyuka shared other hobbies before?

Yes, she regularly uses the #しゅみゆか hashtag to share various personal interests and activities outside of her work with Perfume. These posts give fans insight into her life beyond the highly choreographed public appearances and performances the group is known for.

Why This Moment Matters

What makes Kashiyuka's underwater photos more than just another celebrity Instagram post is the combination of genuine skill, visual beauty, and the window they offer into who she is when the stage lights go dark. We're used to seeing her as part of a trio, moving in perfect synchronization with Nocchi and A-chan, dressed in matching outfits, performing routines that have been rehearsed to the second. These photos show us someone alone, moving through water at her own pace, pursuing a passion that has nothing to do with her career and everything to do with personal challenge and growth.

The freediving certification isn't a publicity stunt—it's a serious undertaking that requires time, training, and commitment. That Kashiyuka chose to share this part of her life, and that fans responded with such warmth and admiration, speaks to a relationship between performer and audience that goes beyond typical celebrity worship. Fans aren't just impressed by her skills; they're moved by the glimpse of authenticity, the reminder that the people who entertain us are complete human beings with depths we'll never fully know.

For those of us who have followed Perfume through their evolution from local favorites to international electronic music pioneers, these quiet revelations—a freediving certification, a mermaid moment captured in blue water—add texture to our understanding of the people behind the performances. And in an entertainment landscape often dominated by carefully managed images, that kind of genuine sharing feels increasingly precious.