I Want to Love You Till Your Dying Day - S01

Fourteen-year-old Sheena Totsuki has known nothing but war and death for as long as she can remember. She and other orphans are forced to train as child soldiers, fighting tooth and nail in a conflict that has dragged on far too long. Casualties are a regular occurrence, and one tragic day that fate falls on Sheena's roommate. That night, Sheena runs into a strange girl covered in blood, yet wearing a cheerful expression that makes no sense. The next day, the girl turns up in Sheena's class as Mimi Kagari, and rumors begin to spread that she might be the orphanage's notorious secret weapon of the same name. Assigned as Sheena's new roommate, Mimi latches onto her right away, leaving Sheena to sort out how she feels about it. Mimi seems strangely clueless about the school and ordinary student life, so Sheena ends up looking after her. Even in these bleak conditions, the mismatched pair grow closer. But Sheena's view of the world starts to fall apart once she learns the truth behind Mimi's unbelievable power.