At an all boys high school, Tadakuni, Yoshitake and Hidenori are close friends and think usually all day about girls. Their high school then co-hosts a school festival with an all girls high school.
Shūichirō Kiriyama works at the Limitation Task Force, the place where the cases which have reached the statute of limitations are destroyed. Getting bored of his job, he decides to find a hobby, because it seems important to him to have a hobby. So he decides to puzzle out the unsolved cases on his free time, helped by his coworker Mikazuki, who seems to have a crush on him.
A rookie detective assigned to the Ginza Police Station finds himself partnered with his estranged father. Together with the rest of the team, they solve crimes as an old adversary plots to take revenge on father and son.
