If you get something, you must give something. This is something Yayu believes in so much.
A year ago, he formed a group to rob a bank out of fun, and set three principles: "Don't kill, don't hurt others, and don't cause large-scale destruction." He also converted all the money he robbed into coins and returned them to the police station. This made their organization famous at that time.
However, he was ultimately arrested by the "Young Detective Team" composed of his younger brother and his companions.
Now, another bank robbery incident with very similar tactics to theirs has been discovered. What is the truth?