Our protagonist is a retired sergeant who joined the army when he was 18. His biggest regret in life was that he never went to high-school due to his poor background. This restricted his promotions as younger officers overtook him and gained higher posts. At 40 years of age, he contracts cancer and passes away. His dying wish was, "God ! if I reincarnate as a human, please let me complete my studies..."

When he woke up, he finds himself in the body of a 15-year-old high school freshman with the name Kanzaki Hiiro. With zero-knowledge about novels, manga or anime how will our protagonist deal with the life of rom-com protagonist?