Glass Heart, the new Japanese drama (J-Drama) coming to Netflix July 31, 2025, has a new teaser trailer showcasing the series’ band, TENBLANK’s sound. The first teaser trailer gives us an electrifying taste of what’s to come in this brand-new musical series.

This isn’t just any J-drama; it’s a take on music, bands, success, and relationships. The trailer features the debut of TENBLANK’s “Crystalline Echo,” sung by none other than Takeru Satoh with lyrics crafted by RADWIMPS’ Yojiro Noda, whose work has been heard in Suzume, Your Name, and Weathering With You.

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The series is based on the novel Glass Heart by Mio Wakagi, published by Gentosha Comics Inc. This new J-drama series is produced by Kensaku Kakimoto, directed by Kohtaro Goto, and written by Mari Okada, Tomoko Akutsu, Shiho Kosaka, and Anna Kawahara. Katsuya Yamada is the series’ Music Producer. It stars Takeru Satoh, Yu Miyazaki, Keita Machida, Jun Shison, Masaki Suda Erika Karata, Akari Takaishi, TAKEHARA PISTOL, and YOU Naohito Fujiki.

What is Glass Heart?

In Glass Heart, we follow Akane Saijo, a drummer who was ousted from her previous band just before her debut, who is unexpectedly chosen by Naoki Fujitani, a reclusive and brilliant musician, to join his new band, TENBLANK. Together with band members Sho Takaoka and Kazushi Sakamoto, the band gains fame through Fujitani’s compositions and their electrifying performances.

We’ll follow TENBLANK as the band rises to stardom, faces numerous challenges, and the toll it takes on Akane. Audiences will see Akane’s journey from obscurity to stardom unfold as Fujitani’s secrets emerge.

Glass Heart isn’t just about the music; it’s about the grind, the rivalry, and the bonds forged in the fires of artistic ambition. Fujitani’s journey sees him clashing with the charismatic Toya Shinzaki (Masaki Suda), vocalist of rival band OVER CHROME, all while navigating the murky waters of a powerful, manipulative music industry producer. Through it all, the members of TENBLANK are there for each other, deepening their connection and solidifying their destiny as a unit.

Promotional poster for Glass Heart from Netflix Glass Heart’s New Trailer reveals TENBLANK’s killer sound

The trailer kicks off with Naoki Fujitani (Takeru Satoh), frontman of the four-piece TENBLANK, as the curtain rises on what looks to be the most epic live performance in Japanese drama history. Over 5,000 extras and 12 cameras capture every single pulse-pounding moment.

It’s all aimed at transporting you to the concert. Sho Takaoka (Keita Machida) on guitar, Kazushi Sakamoto (Jun Shison) on keys, and the breakout heroine drummer, Akane Saijo (Yu Miyazaki) – all underwent intense musical training to ensure their performances are as genuine as they are endearing. It’s nice to see how much the core cast have embraced their roles.

Glass Heart’s unique sound comes from Yojiro Noda and Masahiro Tobinai

“Crystalline Echo,” the song we hear in the teaser, is composed by Masahiro Tobinai and penned by Yojiro Noda, and is just one of several tracks Noda has written for TENBLANK throughout the series.

Glass Heart Casts & Characters

• Erika Karata as TENBLANK’s manager, Miyako Kai
• Pistol Takehara as Genji Kamiyama
• Akari Takaishi as the diva Yukino Sakurai, who performs songs written by Fujitani
• YOU as Momoko Saijo, Akane’s mother and confidante
• Naohito Fujiki as the envious music producer Ichidai Isagi
• Takayuki Yamada, as the vocalist of a popular rock band, Takaoka, once belonged to
• Reini as Mahiro Arisugawa from OVER CHROME
• Miku Uehara as Akane’s friend

Glass Heart releases exclusively on Netflix July 31, 2025.