Shōnen no Zankyō

Shōnen no Zankyō (少年の残響) is a Japanese manga series written and illustrated by Mitsunori Zaki. The manga was first serialized in Kodansha's shōnen manga magazine Monthly Shōnen Sirius from October 2016 to September 2017. It was then transferred to Kodansha's Palcy manga app, where it ran from May 2018 to September 2021, with its chapters collected in four tankōbon volumes as of July 2019.

Publication
Written and illustrated by Mitsunori Zaki, Shōnen no Zankyō started in Kodansha's shōnen manga magazine Monthly Shōnen Sirius on October 26, 2016; following a hiatus that began on September 26, 2017,  the manga transferred to the Palcy manga app, where it ran from May 10, 2018,   to September 6, 2021, and has also been serialized on Comic Days app from October 9, 2021, to March 19, 2022;  and since July 2018 on Pixiv Comics.

Kodansha collected its chapters in four volumes, released from May 9, 2017, to July 9, 2019.