Dungeon Seekers ~Smartphone Appli Kara Hajimaru Gendai Dungeon Seiatsuroku~

The QR code he found by chance led him to download a certain app. The app's name was "Dungeon Seekers." When launched, it was a mysterious thing that could transport him to a dungeon overrun with monsters. Hirotatsu Kurase, a boy who was bored every day and had a weak sense of living, encountered Dungeon Seekers, enjoyed it, and became addicted to it.