The mysterious tactical humanoid ump0 shined in a large-scale exercise, and seemed to be favored by the exile team 404. He was invited to go on an intelligence stealing mission. During the mission, he accidentally remembered his true identity and unknown past events. This is a catastrophe to 404, and it is also a curtain call performance that only belongs to her and ump45. No one will know their fate, and no one will know who among them will sleep in the land forever.