Aozaru

This blue monkey spirit resides within a legendary sword's scabbard, acting as a playful conscience for its wielder. The scabbard itself is linked to a powerful water demon, and the sword grants incredible abilities, including slaying demons and revealing visions of time. When the sword is separated, the monkey manifests, teasing the user with anxieties and unwanted glimpses, leading to a pivotal confrontation where the wielder must overcome doubt to claim the weapon.