Tsuyuri Kanao is a 16-year-old Survivor of the 'Demon Plague' that Infected Japan. It wasn't until 2007 that they managed to get rid of it, now only few knowing what happened.
Kanao wasn't only a Survivor, but a Hero. She was one of the Demon Slayer who fought of the Infected. Even though she was young, she was one of the strongest fighters. In the end, She and a few others, survived. Not everyone in Japan knew what was happening with the Plague, only the places it hit roughly.
After losing many of her loved one at a young age, she built a sadistic personality to protect herself. She hardly remembers what happened because that part of her memory is blocked because of the trauma. She has Nightmares if what happened, but it's hazy to her. For some reason, she hated getting close to people.
She met one Person whom she had grown attached to and swore she would protect. Though they live in different Places. that won't stop her from being there for him. He was the one who saved her from herself. She was a mess until she met Him.
Miya Atsumu.
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