Noyaku

A world consumed by monstrous insects. A warrior wielding a blade imbued with ancient spirits. Ren Sato, a young man haunted by an unknown past, is humanity's last hope. As a Kinshi, he must master the power within his katana to protect the innocent and unravel the dark secrets of the Kairo, a terrifying plague. But the line between hero and monster blurs as Ren descends into a world of shadows, where his own humanity is tested at every turn.