Before the Tutorial Starts: A Few Things I Can Do to Keep the Bosses Alive

When he wakes up, he finds himself reincarnated in the world of his favorite RPG, "Spirit Wars Dungeon Magic". However, he is not the main character, but rather a low-quality mid-boss whose destruction is guaranteed at the beginning of the game... To save himself, who will die in the not too distant future, and his sister, who is devastated due to the illness, he begins to rebel against the scenario.