Zankyō (Japanese: 残響; “Reverberation”) is a Japanese manga series written illustrated by Tsutomu Takahashi. It was serialized in Shogakukan‘s seinen manga magazine Big Comic Superior from May 2015 to October 2016, with its chapters collected in three tankōbon volumes. Publication Zankyō, written and illustrated by Tsutomu Takahashi, was serialized in Shogakukan‘s seinen manga magazine Big Comic Superior from May 8, 2015, to October 14, 2016. Shogakukan collected its chapters in three tankōbon volumes, released in October 2015, May 2016 and…