※A book version of the first volume is now available from Famitsu Bunko, with additional content delving deeper into the dark aspects of Abikoru. Please give it a try. --- Can you face the darkness!? I found myself in a world that closely resembled the social game 'Abyss Calling,' where players use randomly summoned 'Familiars' to go on adventures. The game was notorious for its probability manipulation by the developers, a rare greed sensor, and a pay-to-win game balance. It was called the ultimate money-making system and had brought millions of users to the bottom before being shut down due to legal regulations. I, who was once a player, have risen again as a summoner (Caller) to complete what I left unfinished. This is the story of brave summoners who challenge the darkness. ※Also posted on Kakuyomu.