Shinjiteita Nakama-tachi ni Dungeon Okuchi de Korosarekaketa ga Gift "Mugen Gacha" de Level 9999 no Nakama-tachi wo Te ni Irete Moto Party Member to Sekai ni Fukushū & "Zamaa!" Shimasu! #21

This manga series, often abbreviated as Mugen Gacha, originated as a light novel written by Meikyou Shisui and illustrated by TakayaKi. Following the success of the digital narrative, the manga adaptation began serialization in the digital magazine Magazine Pocket, with character designs and illustrative work handled by ecost. The story explores the popular 'betrayal' subgenre of fantasy fiction, following a protagonist who is cast aside by his companions only to discover a unique, powerful ability that allows him to summon high-level allies.

The specific release of issue number 21 represents the ongoing digital serialization efforts of the manga. Like many contemporary titles in the genre, the series relies on a rapid release cycle designed for digital consumption, focusing on dramatic pacing and fantasy progression. The artwork by ecost is tailored to emphasize the scale and power of the summoned characters, which has helped the title maintain a consistent following within the highly competitive landscape of Japanese web-manga platforms.