I Want to Love You Till Your Dying Day manga volume 2 features story and art by Nachi Aono.

Undeterred by war and violence, Sheena commits to protecting Mimi, an immortal girl deployed into battle. As the two become closer, Mimi puts national security at risk when she discloses her status as a classified military weapon. This lapse in judgment angers the authorities, including those who run the magical orphanage. Mimi throws herself into even more deadly clashes and survives fatal wounds—thanks to a dark magic connected to love. Can Sheena harness that power to rescue Mimi and help bring about peace?