Tantei Xeno to Nanatsu no Satsujin Misshitsu (Japanese: 探偵ゼノと7つの殺人密室, Hepburn: Tantei Zeno to Nanatsu no Satsujin Misshitsu) lit. 'Detective Xeno and the Seven Locked Murder Rooms' is a Japanese manga series written by Kyoichi Nanatsuki and illustrated by Teppei Sugiyama. It was serialized in Shogakukan's shōnen manga magazine Weekly Shōnen Sunday from November 2017 to July 2019, with its chapters collected in eight tankōbon volumes. Source: Wikipedia (en)