On a fateful day, the elite Grim Reaper Lisara ventures into the human realm driven by personal motives. Struggling to locate her mark and drained of energy, she encounters Ryosuke Kaga. Moved by his offer to assist, Ryosuke guides Lisara to his welcoming abode, pledging his unwavering support. In a surprising turn, Lisara, upon hearing his words, embraces Ryosuke, setting the stage for unforeseen developments...