I Awakened an F-Rank Rusty Blade, But It Was Actually a Shinigami Inheritance

What the story is about

After reincarnating as Jiang Yang, an F-rank student in a world threatened by monsters from spatial rifts, he awakens a system that grants him the powers of a Soul Reaper. Armed with Zanpakuto and spiritual techniques, he quickly rises from a mocked underdog into a formidable fighter while keeping the source of his power secret.