Kojo Saegusa

Tetsuko (Eiko Yanami), a high school student, one day, forces Tsuneo, (Kei Wakakura), the brightest boy in her school, to make love to her after school is out and they are caught by the old school janitor. Tsuneo's mother, orders Tetsuko to pay for what she did to her son but Tetsuko blackmails her instead, saying that she is ready to inform a news company of what has happened to Tsuneo and receives one million yen hush money. Expelled from school, she comes to Tokyo, intending to take a round-the-world trip. But Sankichi (Yoshihiko Aoyama), a jack-of-all-trades, cheats her. So, she makes up her mind to catch him and get back her money.

The former Japanese Naval Academy was at Etajima, one of the many islands of the beautiful Inland Sea. Among the new cadets were Ishikawa and Murase. Murase's mother had remarried after his father's death and the impressionable boy hated his overbearing father who held the whip-hand over his gentle mother. Out of defiance of his step-father he became wayward. But he was bright and his teacher persuaded him to enter the Academy as he knew that if he left home, his mother need not feel apologetic towards her husband on his account. Discipline was strict, their studies were hard and, in between, all the new cadets received an ample share of beatings, at the hands of the senior cadets, for the slightest mistakes. Murase thought all picked on him the most, especially Cadet First Class Kogure, who manhandled him at the slightest excuse.