In high school, he was the ace of the rugby club and a nationally watched player, but he was injured because of his self-righteous over-playing. Blamed by his teammates, Sora retired in a state of isolation and helplessness. After graduation, he lived alone and did not find a stable job, living a leisurely and carefree life. One day, he was fired from his job at the construction site because of a quarrel that alarmed the police, and was asked to move out of his apartment because of overdue rent, and he was in a desperate situation. In this situation, a man said to him, "I will introduce you to a job that suits you!" "The dormitory is well-equipped, and there are three meals a day! It's perfect for you who are proud of your physical strength!" The job introduced... unexpectedly! It is the "Ground Self-Defense Force" that protects the peace and security of the country! "Kokusei Sora! A man born in the country with a heart as broad as the universe! Isn't he born to be a Self-Defense Force officer?" Sora, who was recognized by the man, initially refused, but "I can't live without a job and can't rent an apartment. If I can get paid as a trainee, I'll agree first." The result of his half-hearted determination was that he became a candidate for the Ground Self-Defense Force. What awaited him in the place where he entered with a half-hearted mood was brutal training. With the opportunity of encountering the "Ground Self-Defense Force" as a job, he met important partners, friendships began, and sometimes love, accumulating various experiences, noticing the importance of connections between people, and growing up little by little. The young man who joined the army with the idea of "giving up on himself" becomes a real Self-Defense Officer who is suitable to wear the hat of a Self-Defense Officer to protect himself = "Teppachi". The immature "self-destructive" life turns into a real "Teppachi" life -!