The official YouTube channel for vocalist sana's solo project, sajou no hana, started steaming a new video for "Éternel," the ending theme for the upcoming summer 2026 TV anime I Want to Love You Till Your Dying Day . The title "Éternel" means "eternal" in French. The series will broadcast in Japan beginning on July 7. sajou no hana "Éternel" Special Video sajou no hana was originally formed in 2018 as a three-member band consisting of vocalist sana, keyboardist Sho Watanabe, and bassist Tatsuya Kitani ( JUJUTSU KAISEN Season 2 theme song). In December 2023, the band announced that they would move on to become a solo music project centering on sana. "Éternel" will be available on digital platforms on July 15. sajou no hana shared the following comment about the song on the anime's official YouTube channel: I am very happy and honored to have been given the opportunity to perform the ending theme song. I agonized a lot over what kind of lyrics I should write for the story set in a world where death is a constant companion and various emotions begin to sprout. Within that, I wanted to depict the preciousness of the time spent with the person you are with now, so I titled it "Éternel," which means "eternity" in French.