Tenblank is a fictional band featured in the Japanese Netflix musical-drama series Glass Heart (2025). The group is portrayed by actors Takeru Satoh (as Naoki Fujitani), Yu Miyazaki, Keita Machida, Jun Shison, among others. Their performance is not just acting — the cast has trained for months, learning instruments and singing their own parts, to bring musical authenticity to the series.

On September 13, 2025, at Yanmar Stadium Nagai in Osaka, ONE OK ROCK performed together with Tenblank, merging the real-life rock energy of ONE OK ROCK with the vibrant musical world of Glass Heart. The crossover included actors from Tenblank on guitar and piano — specifically Keita Machida as Sho Takaoka (guitarist) and Jun Shison as Kazushi Sakamoto (pianist) — joining ONE OK ROCK on stage. This fusion of fiction and reality amplified the emotional moment for fans, honoring both ONE OK ROCK’s rock legacy and Tenblank’s dramatic journey in Glass Heart.