Introducing BLUE REGRET。
With the captivating catchphrase “Blue regrets become melodies for tomorrow,” BLUE REGRET。 presents itself as a “melodic rock idol” group. Their musical style fuses catchy, singable melodies with powerful rock elements, creating a distinctive sound. The group consists of four talented members: Kida Karin, Takanashi Rei, Shimaneko Tsuna, and Amane Mero. Their official group colors are a striking blue and white, without individual member colors, emphasizing their unity.
Zepp SHINJUKU Pre-Debut: A Glimpse of Their Future
BLUE REGRET。’s first stage appearance was as the opening act for their senior group BOCCHI。’s 5th Anniversary LIVE, part of the “SEVENTEEN FES presents” event at Zepp SHINJUKU. Despite it being their pre-debut, the venue was filled with an eager audience. The group showcased remarkable stage presence, delivering three original songs. Their opening track, “Monologue,” stood out with its powerful, fast-paced sound, suggesting a narrative filled with hope and determination for their journey ahead.
“It felt like watching a story unfold, full of potential and raw energy!” exclaimed one fan after their Zepp SHINJUKU performance.
A digest of their pre-debut live performance can be viewed here: https://youtu.be/TSQIyz83A4
Full Debut and Music Release
Just eighteen days after their pre-debut, BLUE REGRET。 will make their official debut on December 20, 2025, at the “IDOL∞INFINITY Christmas SP” event held at Ebis303 in Ebisu, Tokyo. This marks the beginning of their official journey to captivate fans and bring a fresh dynamic to the idol landscape.
Coinciding with their debut, four of their original songs will be available on streaming services starting December 20:
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“Monologue”: https://linkco.re/zZZDemYU
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“Transparent Amnesia”: https://linkco.re/Zdx35GM6
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“You are mine!”: https://linkco.re/AZ0QVbD5
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“Gensei Toka”: https://linkco.re/scmsRtvS
Debut Live Overview
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Date: December 20, 2025 (Saturday)
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Venue: Ebis303, Ebisu, Tokyo
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Live Performance: 10:50～11:10
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Fan Meeting: 11:20～12:20
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Ticket Information: https://ticketdive.com/event/idol_infinity_christmas_sp
Connect with BLUE REGRET。
Stay updated with BLUE REGRET。’s journey through their official channels and member social media:
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Official Website: https://bluereg.club
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X (formerly Twitter): https://x.com/BLUEREGRET_GDL
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Instagram: https://www.instagram.com/bluereg_official_/
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Kida Karin (X): https://x.com/karin_kida
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Takanashi Rei (X): https://x.com/ReiTakanashi817
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Shimaneko Tsuna (X): https://x.com/shimaneko_tsuna
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Amane Mero (X): https://x.com/mer0_amane
As BLUE REGRET。 steps onto the main stage, their unique blend of melodic rock and a compelling narrative hints at a promising future. Their debut could mark a significant moment for fans of Japanese idol culture, potentially influencing future trends and captivating international audiences with their distinctive sound and visual aesthetic.
