A serial arsonist sets huge fires across the city and Takagi and Sato with the Detective Boys are out to solve it. It turns out this is also the day the case of Sato's father's death will be annulled, and the bank robber will be able to keep the money he stole from the bank. Sato sets out to solve both cases before the day ends, but Takagi has been attacked by the arsonist.