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.
