DNAngel Exhibition Cassette Tape Index Cards by Triball were originally released and sold at the DNAngel Exhibition held at the Marui City Store in Yokohama in May 2021, and later released on the Marui Web Channel's online anime shop for mail order, as well as resold at the other exhibitions. These cute decorative index cards feature popular illustrations by Yukiru Sugisaki, and were created to commemorate the completion of Sugisaki's long time and internationally beloved manga work after 24 years.