You run a perfume store, carry yourself as a second-generation otaku, and have carved out an ordinary but genuinely happy life. Then a sudden car accident knocks you unconscious — and when you come to, three unusual figures are standing over you: representatives of the Human Soul Transit Center, one each from the realms of angels, demons, and fallen angels. You were supposed to die in that accident. Something prevented it. They are here to observe your life while the anomaly is investigated. As you spend more time with the three of them, the truth of the accident begins to surface — along with a hidden agenda no one mentioned at the start.