Bleach is a shonen "big three" anime that focuses not on Devil Fruits or ninjutsu, but zanpakuto – soul-cutting swords. The concept of zanpakuto was introduced almost right away in Bleach, with Rukia Kuchiki wielding one in battle against a Hollow before Ichigo Kurosaki gained his own zanpakuto to finish the fight. Ever since then, zanpakuto have been a staple of Bleach's combat system.
Source：https://www.cbr.com/bleach-zanpakuto-guide/
