Shūrai

Shūrai (襲雷, Lightning Strike) is a technique of Hayato Nakamura's, Tenraimaru.

Description
At the instant of the slash, Tenraimaru releases highly condensed lightning at the tip of the blade, which, magnifying the slash attack, flies forward instantaneously. Though the Shūrai is the simplest technique of Tenraimaru, it can be used with great efficiency.