Shikoku Aquarium 5th Anniversary: '459 (Shikoku) Gentle World Project' Launched with Kagawa-Connected VTubers!
Shikoku Aquarium celebrated its 5th anniversary by releasing the commemorative song 'Yasashii Sekai' on April 5, 2026, sung collaboratively with 8 local VTubers to promote the charm of Kagawa Prefecture.
📋 Article Processing Timeline
- 📰 Published: April 16, 2026 at 00:38
- 🔍 Collected: April 15, 2026 at 16:01
- 🤖 AI Analyzed: April 19, 2026 at 11:29 (91h 27m after Collected)
Shikoku Aquarium (Location: 4 Hamaichibancho, Utazu-cho, Ayauta-gun, Kagawa Prefecture) is pleased to announce that on April 5, 2026, at 9:00 AM, as part of the '459 (Shikoku) Gentle World Project', we released our 5th-anniversary song 'Yasashii Sekai' (Gentle World) sung together with 8 VTubers connected to Kagawa Prefecture.
■ 459 Gentle World Project
Initiated by VTuber 'Yume Setousa', who promotes the charm of Shodoshima to revitalize Kagawa Prefecture, this is an initiative where 8 VTubers connected to Kagawa and Shikoku Aquarium's promotional captain Shukokun sang the 5th-anniversary song 'Yasashii Sekai' and released it simultaneously at 9:00 on April 5 (4-5-9, a wordplay on Shikoku).
■ Shikoku Aquarium 5th Anniversary Song 'Yasashii Sekai'
Composed by Tomokazu Yamada, a Kagawa native who has provided music for idol groups like AKB48 and Nogizaka46, various artists, and famous anime such as Idolmaster and Love Live!. The song features a bright and warm melody that visitors can hum along with their memories. Created to symbolize the journey of our staff over the 5 years since opening and the feelings we cherish.
'Yasashii Sekai' sung by Shikoku Aquarium's promotional captain Shukokun
■ Participating VTubers (Honorifics omitted, in Japanese alphabetical order)
[Koto Umimori]
- Youtube: http://youtube.com/@vtuber-kotoumimori-2438
- X: https://x.com/umimori_koto
Belonging to Kotohira Bus Co., Ltd., I'm travel VTuber Koto Umimori. I also serve as a virtual planner for Kotobus V Online Bus Tours. Broadcasting the charm of various parts of Japan through streams and tours. Delivering the joy of travel to you, crossing distances!
[Miko Udonno]
- Youtube: https://www.youtube.com/@%E9%A5%82%E9%A3%A9%E4%B9%8B%E3%83%9F%E3%82%B3
- X: https://x.com/sanuki3939
I'm Miko Udonno, who loves Kagawa Prefecture. As a local VTuber and local hero, I support Mure-cho, Takamatsu City, and Higashikagawa City.
I'm also doing activities to spread the #HelpMark.
I have developmental and intellectual disabilities, which makes some things difficult, but I'm doing my best at my own pace, so please support me.
[Ayusa Kaiwagi]
- Youtube: https://www.youtube.com/@kaiwagi-ayusa-vtuber223
- X: https://x.com/Kaiwagi_Ayusa05
I'm Ayusa Kaiwagi, a VTuber mainly streaming horror games, from Kagawa.
I also sub-actively create horror games set in Kagawa and do local PR activities!
I want to create something big together with everyone I've connected with someday! A creator brain at heart♪
[Sakanasakana]
- Youtube: https://www.youtube.com/@sakana_o59
- X: https://x.com/sakana_O59
Freely! Living happily! An independent VTuber living in Kagawa who used to be a fish and is now human! I usually stream anime and games, but I love Kagawa Prefecture, which is full of artistic charm, and I'm currently taking it easy while interacting with art to convey its goodness! You will surely find the potential of art!
[Mai Sanuki]
- Youtube: https://www.youtube.com/@sanukimai
- X: https://x.com/sanukimai2022
I'm Mai Sanuki, an independent VTuber who roots for Kagawa Prefecture on my own!
With the footwork of having conquered over 200 udon shops, I visit somewhere in the prefecture every week and stream myself truly enjoying the local area as a resident!
Let's enjoy Kagawa Prefecture together with Maimai♪
[Yume Setousa]
- Youtube: https://www.youtube.com/@YUME_DRE_am
- X: https://x.com/YUME_DRE_am
Cheering up the world from the Seto Inland Sea!
I'm active as a local VTuber in Kagawa Prefecture, mainly promoting the charm of Shodoshima.
■ 459 Gentle World Project
Initiated by VTuber 'Yume Setousa', who promotes the charm of Shodoshima to revitalize Kagawa Prefecture, this is an initiative where 8 VTubers connected to Kagawa and Shikoku Aquarium's promotional captain Shukokun sang the 5th-anniversary song 'Yasashii Sekai' and released it simultaneously at 9:00 on April 5 (4-5-9, a wordplay on Shikoku).
■ Shikoku Aquarium 5th Anniversary Song 'Yasashii Sekai'
Composed by Tomokazu Yamada, a Kagawa native who has provided music for idol groups like AKB48 and Nogizaka46, various artists, and famous anime such as Idolmaster and Love Live!. The song features a bright and warm melody that visitors can hum along with their memories. Created to symbolize the journey of our staff over the 5 years since opening and the feelings we cherish.
'Yasashii Sekai' sung by Shikoku Aquarium's promotional captain Shukokun
■ Participating VTubers (Honorifics omitted, in Japanese alphabetical order)
[Koto Umimori]
- Youtube: http://youtube.com/@vtuber-kotoumimori-2438
- X: https://x.com/umimori_koto
Belonging to Kotohira Bus Co., Ltd., I'm travel VTuber Koto Umimori. I also serve as a virtual planner for Kotobus V Online Bus Tours. Broadcasting the charm of various parts of Japan through streams and tours. Delivering the joy of travel to you, crossing distances!
[Miko Udonno]
- Youtube: https://www.youtube.com/@%E9%A5%82%E9%A3%A9%E4%B9%8B%E3%83%9F%E3%82%B3
- X: https://x.com/sanuki3939
I'm Miko Udonno, who loves Kagawa Prefecture. As a local VTuber and local hero, I support Mure-cho, Takamatsu City, and Higashikagawa City.
I'm also doing activities to spread the #HelpMark.
I have developmental and intellectual disabilities, which makes some things difficult, but I'm doing my best at my own pace, so please support me.
[Ayusa Kaiwagi]
- Youtube: https://www.youtube.com/@kaiwagi-ayusa-vtuber223
- X: https://x.com/Kaiwagi_Ayusa05
I'm Ayusa Kaiwagi, a VTuber mainly streaming horror games, from Kagawa.
I also sub-actively create horror games set in Kagawa and do local PR activities!
I want to create something big together with everyone I've connected with someday! A creator brain at heart♪
[Sakanasakana]
- Youtube: https://www.youtube.com/@sakana_o59
- X: https://x.com/sakana_O59
Freely! Living happily! An independent VTuber living in Kagawa who used to be a fish and is now human! I usually stream anime and games, but I love Kagawa Prefecture, which is full of artistic charm, and I'm currently taking it easy while interacting with art to convey its goodness! You will surely find the potential of art!
[Mai Sanuki]
- Youtube: https://www.youtube.com/@sanukimai
- X: https://x.com/sanukimai2022
I'm Mai Sanuki, an independent VTuber who roots for Kagawa Prefecture on my own!
With the footwork of having conquered over 200 udon shops, I visit somewhere in the prefecture every week and stream myself truly enjoying the local area as a resident!
Let's enjoy Kagawa Prefecture together with Maimai♪
[Yume Setousa]
- Youtube: https://www.youtube.com/@YUME_DRE_am
- X: https://x.com/YUME_DRE_am
Cheering up the world from the Seto Inland Sea!
I'm active as a local VTuber in Kagawa Prefecture, mainly promoting the charm of Shodoshima.