"Ding dong Kiddo's! Let's all start the day with a quick speech by our little host I chose. Rika is going to give a speech then will proceed to read out the activities that you would be doing today! Let's have a punny day today! I want it a deadly one... Let's stop with the tear-able jokes, it's gone very stale," the announcement went, "Uppp!"

With a little face palm everyone went out and went to the hall. Rika was standing there with a script in hand. She than read out from the paper.
"Good morning students, I am Rika Sciensu the Ultimate Forensic Scientist. I was told to make a speech by Monokuma. I want to say that I want everyone to know each others forbidden code. It's just not right if we don't trust others. At least tell the detective your forbidden code. Now, back to the notices. Monokuma wants to remind us that the forbidden code will be deactivated for a while and will be released outside tommorow and someone has stolen a knife from the kitchen," Rika read out, "That is all."
Rika then was taken by Monokuma and was lifted to the roof and disappeared.

Mission ;
Debate on trusting Saki, the detective, about the forbidden code you have around your neck.
Do as you wish next till the murder happens... Or find out who stole the knife...