Riku Sakaki, who has a gift [gacha], dives into dungeons even though he is a bottom explorer, and spins gacha while streaming every day.. However, there are days when I only get the wrong N.... One day, Riku finally hits a UR, but it turns out to be a living black slime.. Furthermore, the black slime who was supposed to have become a slave demon has a lazy personality and does not want to move at al…