Quick Transmigration: I Am the Protagonist's Experience Points

Due to a departmental reshuffle, Sena, a System who used to work in the Romance Bureau, is forced to transfer to the Apocalypse Bureau. To survive, Sena begins her journey as a temp worker trying to earn a permanent position. World One: Spores infect the entire world. She sacrifices herself to hold off the infected and protect the life-saving medicine, all to buy the protagonists more time. World Two: The Endless Tower. No matter how hard they try, they can’t escape the strange building. In the end, she gives up her life to break the spell of the illusory world, making sure the protagonists get out safely. Sena devotes herself to becoming the protagonists’ experience points, serving as a stepping stone and occasionally playing the self-sacrificing saint, helping them overcome each challenge. Just as her assignment nears its end and a permanent position seems within reach, her System suddenly develops a bug... This is the story of a System that has worked for hundreds of years and only wants to settle down and coast, but is forced to work hard.