One day, Kunio rescued a student, Kurebayashi, who was not feeling well on the street. Kunio's heart flutters at the sight of her dainty appearance and sexy behavior, but Kurebayashi turns out to be a Red Lion, an assassin sent by the Kanto Lion Union, a gang of delinquents led by the Lion King. It was Misuzu, the female guardian of Taiyo High School, who first sensed Kurebayashi's ruse.

The straight-laced Kunio is always determined and always solves everything with one word: "Nekketsu". Misako, however, is not so sure about her future. With Hakuo's encouragement, Misako decides to enter a newcomer audition organized by a famous music producer Onishima, aiming to become a singer, which has always been her dream.