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One morning, Seiji Sanada, a 30-year-old office worker, found himself transported back to his sophomore year of high school. He had always regretted never confessing his love to his world history teacher, Haruka Hiiragi, and was determined to do so this time around. To his surprise, she responded positively, and they began dating in secret. It seemed like the beginning of a perfect romance, but Hiiragi-sensei was incredibly sweet and doting, leading to a flirtatious and rose-colored school life for the pair.
Those who curse the world with their dying breath becomes demons. The ones who protect the country from these demons are the Children's Choir who have received divine blessings from the angels. Hymns sung by these children who are pure in body and soul are exceptionally beautiful. They are able to kill the demons with their pitch perfect harmony. As such, the demons are always looking for a chance to kill these children once night falls. However, there's one poor little boy who just can't seem to hit the perfect note...
