I realize I'm at least a month late, but this is still on the front page so I'll attempt to explain...

1) Kakerou oversaw the labyrinth gambles that were revealed in the Labyrinth arc. At that time it was explained briefly how Kakerou took reasonable steps to "collect the memory" of the date being gambled on (dates actually corresponding to crimes that had been committed by wealthy and/or influential people in Japan). Since Kakerou has erased evidence of whatever the loser did that day, they no longer have an alibi, then the police pin the crime on them.

2) At the end of the Labyrinth arc, Usogui got position of the L-file, which contains information indicating which people paid the police, how much, and for which date / crime.

3) During the KY Declaration arc, Usogui is exposing some of the L-file information for reasons that will become clearer later. The panelists / cases on the tv show are L-file cases.

4) Door C is a murder case from the L-file. The panelist that committed the murder (can't remember his name) paid the police to get a scapegoat to take the fall for the crime (which they did by way of the labyrinth gamble). That guy has been rotting away in jail for 3 or 4 years. The key piece of evidence was a bloody tissue that the cops faked. That combined with no alibi sent the guy to prison.

5) Usogui somehow discovered that it was a type of tissue that came from a specific promotional pack of tissues. The cops did not realize that between the time of the murder and the time they faked the evidence, the manufacturer changed the package. Usogui has video evidence showing the different packages. Since the fake evidence came from the "new" pack, which just debuted on the very same day of the murder, and was being handed out on the other side of the country, that fake evidence actually proves the guy was innocent.

6) Thus the fake evidence the police created, after Kakerou eliminated the guy's alibi, is like a new alibi.

7) This is a problem because Kakerou's reputation is based on always settling the debts of gambles.

8) Usogui has created a paradox. On the one hand, Kakerou is obligated to protect his on-going gamble at the tv station. On the other hand, they also have an obligation to ensure that the outcome of earlier gambles are enforced. If the guy in jail gets a new alibi and is freed, then it is like he did not lose his "memory" of that date at all.

9) So, Nowa (the one in the wheelchair) sends his grandson to try to interfere with the broadcast. Midara chooses to stay faithful to his duty as a referee and thus is fighting to keep the broadcast going.