Hoshi, an F-rank explorer, ends up diving into a dungeon as a support for a livestream at the invitation of his childhood friend. Everything is going smoothly until they trigger a trap and an S-rank monster suddenly appears before them. Just as everyone is about to give up hope, the F-rank Hoshi easily blows it away. Seeing the response, Hoshi decides to start his own livestream to earn some pocket money, but... With his own home dungeon and mysterious pets, the unconventional Hoshi gradually gains attention, going viral and blowing up—!