Acid Permeation

Using his Soap Bubble Ninjutsu, Utakata creates acidic bubbles. Due to the nature of the bubbles they can be targeted at a specific spot or used as a wide-spread attack. These bubbles burn the opponent when popped.

Trivia

 * Santōka is the given name of . He was a haiku poet, well-known for his free style haiku lacking the traditional 5-7-5 syllabic rule and seasonal word. He is called a wandering poet for the many trips he took in his later life as a Buddhist monk, wandering through Japan without being part of a monastery.
 * The san in Santōka's name is actually written with the kanji for, but for this technique, it is interpreted as , also pronounced san. Tōka is interpreted as meaning instead of  and , which it means in Santōka's name.
 * Though not seen in the manga, the databook states that Utakata was capable of combining acid with his Soap Bubble Ninjutsu.