The Soul Slayer

In a feudal-Japan-inspired world plagued by dark spirits, teenage Curlian is impaled by a rune-carved relic that absorbs a high-level spirit into his soul, granting him the power to shift onto the spiritual plane and grow stronger by absorbing spirits. Carrying the relic after their first encounter, Curlian and shrine traveler Ascensia journey toward Eidolon, a distant town where ancient sages may explain his power. Ascensia is seeking the sages' powerful anti-curse spirit tags to cure her father, and the two agree to travel together for company and safety.