Cagaster of an Insect Cage

Cagaster of an Insect Cage (虫籠のカガステル) is a Japanese manga series by Kachō Hashimoto released from 2015 to 2016 in the serialized magazine Monthly Comic Ryū. Prior to becoming a manga series, Cagaster of an Insect Cage was first a dōjinshi series posted on Hashimoto's website, which was published from 2005 to 2013.

The series was adapted into an original net animation (ONA) series produced by Studio Kai and directed by Koichi Chigira, which premiered on Netflix on February 6, 2020.

Synopsis
The series takes place in a post-apocalyptic world that revolves around a virus that turns humans into giant carnivorous insects known as "Cagasters" that feed on humans.

Manga
Originally published on Kachō Hashimoto's website from 2005 to 2013, Tokuma Shoten picked up the series for publishing under its Comic Ryu brand in 2015. The manga ran for 32 chapters in 7 tankōbon volumes. In 2020, Ablaze Publishing licensed the series for an English release.

Anime
A Netflix anime adaptation of Hashimoto's manga was originally announced in 2018 with Koichi Chigira directing the series at Gonzo. However, Studio Kai, a company spin-off of Gonzo, took over the series' production. Shūichi Kōyama was in charge of the series composition, and Hitomi Kuroishi composed the score; Akihiko Yamashita adapted the character designs for animation. It was released worldwide on Netflix on February 6, 2020. On December 11, 2020, it was announced that Sentai Filmworks has licensed the anime for home media.