abstract
| - The Nin Shuriken are divided into three types: Transformation Nin Shuriken (変化忍シュリケン Henge Shuriken), Technique Nin Shuriken (技忍シュリケン Waza Nin Shuriken), and OtomoNin Shuriken (オトモ忍シュリケン OtomoNin Shuriken lit. "Companion Ninja Shuriken", derived from "Companion" (お供 Otomo)). The Nin Shuriken were initally created by Yoshitaka Igasaki's friend, the weaponsmith Tetsunosuke Saika XXI, who is succeeded by his son Tetsunosuke Saika XXII. However, in certain cases, when the Ninningers sharpen their Nintality (忍タリティ Nintariti, combined form of "Ninja Mentality") enough times, the purified Sealing Shuriken used to create Youkai can transform into new Nin Shuriken to expand their arsenal.
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