Here's How it Happened!
Act 1
This case started off at night. With one person in our group venturing into everyone else's room to take one item that belonged to them. Including the victim in our case. The DigiBot from Hammer's room. Little did they know what the DigiBot actually was. They hid the items in different areas of the school. I actually Grimdark's medals in the Monomono machine. They kept them there in those spaces to make us suspicious of one another.
Act 2
As the next day went on. The culprit suddenly felt this rage against Hammer, wanting to hit him where it hurts they devised a plan. Destroy the DigiBot. They waited until Night-time and carried the DigiBot from it's hiding spot and carried it all the way up to the fourth floor. Something like this was easy for the culprit due to their extra strength that they possessed.
Act 3
They took the DigiBot up to the mechanics room to put their plan in motion. First: they stuffed the DigiBot inside the secret compartment they found most likely by chance during the investigation of the fourth floor. They waited for it to get closer to the morning announcement so that they could make it hard for anyone to have an alibi at the time of the murder. She took the DigiBot out of the secret compartment and three hammers off of the rack on the wall.
Act 4
The culprit took the medium sized hammer and brought it down on the DigiBot's head and left the other two neatly by its side. They probably were planning to keep the medium one there as well but they noticed the dirty fingerprints that had passed onto the hammer and hatched a new plan. Using the sizes of the hammers, they tried to make it look like other students could have easily killed the DigiBot and therefore also be blamed for the robberies.
Act 5
Next, the culprit snuck past Samurai who was also present on the fourth floor with the hammer hidden on their person. They made their way down to the physics lab and over to the incinerator. They took out the hammer and threw it down the chute and activated the pressure sensitive plates, burning up the evidence of their involvement. But unfortunately, they didn't realize the consequences of what they had done.
And this is the truth of what transpired. I've knocked you're argument out of the ring...Punch Out!
"So...you figured it all out" Beau smirked.
"No...no he FUCKING hasn't!" Punch yelled.
"H-huh?"
"What the hell is so suspicious about knowing about what the machine was? So what if I knew it was the DigiBot?! I ain't giving up yet you piece of shit!"
"Punch..."
"........"
"I don't want to do this, but...I can't let everyone else die!"
Machinegun Talk Battle
Punch- You can fuck off you piece of shit!
Punch- Trying to blame this bullshit on me!
Punch- Asshole!
Punch- No way! I didn't do anything wrong!
Punch- I didn't touch that hammer!
Punch- So what? I hate your fucking guts!
Punch- You're making a mistake
Punch- You're wrong, you're wrong!Enough!
Punch- So what if I knew that it was a robot? There's a list of the stolen items in the cafeteria!
'Secret Machine'!
"The problem with the list is...the machine is labelled as a 'secret machine'...so that is no excuse for being able to know what the DigiBot actually was!"
"B-but..." Punch dropped her arms. "...fuck it...I'm tired of dragging this on..." She sighed.
"Well! That's my cue!" Monokuma yelled. "It's ballot time! Cast your votes on who you think the culprit is with the buttons in front of you, remember, majority wins! Now will it be right? Or will it be oh so wrong? Who's it gonna be? What's it gonna be?"
As the final button was pushed for voting, the huge slot machine appeared with 'Voting Machine' in red on the top. The three dials began to spin quickly for another few seconds before all three stop on Punch's face causing a red 'GUILTY' sign to flash and the two bouquets of flowers to pop out the sides.
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"Going strong people! That's four in a row! The one that bashed the DigiBot's mechanical skull in was none other than Punch Out!"
"F...fuck..." She grunted.
"Punch...why?" Olive asked sadly.
"I...I was trying to get back at Hammer for all of his annoying, perverted comments..."
"That's it...?" Hammer said. "You...you should have just told me that you didn't like how I talked like that...you didn't have to do what you did..."
"I realized that a little to late...Celestia dammit! I'm such a fucking idiot!"
"Punch...did you...did you really take all of our stuff?" Samurai asked, not looking up from his stand.
"Y-yeah...it was just for a little joke though...then Grimdark's medals went missing...and that meant someone knew..."
"So...someone else put Grimdark's medals in the Monomono machine?" Serenade concluded.
"Must have...dunno who it was though..."
"So where's the rest of our stuff?" Nimbus folded his arms.
"In my room...here" Punch took out her key and handed it to Serenade. "As a memento...and so you can get your stuff back" she giggled.
"H-how...how can you laugh at a time like this? You're gonna be executed!" Grimdark reminded her, but Punch didn't see phased.
"Yeah I guess that's one way to look at it...but it'll probably get you closer to the end of this hell hole!"
"P-P-P-Punch..." B whimpered.
"Hey, Serenade!" Punch smiled.
"Yeah?"
"Looks like I kept my promise to you until the very end!"
"Promise?"
"Back on the first day, I promised to be your teammate, your protector and your...your friend...I promised to help you get out of here and that's exactly what I did so I ain't got any remorse! It's not like I actually took another students life!"
"Which should make it worse! You're being killed because of a robot!" Grimdark yelled at her.
"Oh well, win some, lose some as they say..."
"Well it seems that-"
"Wait, could I just do one, teeny little thing before you execute me?"
"Hm? Depends..." Monokuma looked interested.
"Um...S-Serenade...?" Punch stood right in front of the shorter blue Pegasus. "I should...I should tell you about that second condition, or at least...show you..."
"What are you-" Serenade was cut off Punch kissing him on the forehead causing him to stumble back in surprise.
"Hehehehe! I never had my first kiss so I was gonna ask you then! Better late than never, right?"
"I, you- wait, you can't just. WHAT?!!" Serenade said in a stuttered mess.
"Not exactly the reaction I was hoping for" Everyone looked at her in shock, even Beau's poker face had shattered away.
"You can't just kiss me before you're about to die!"
"Meh, what can you do?" Punch shrugged.
"Y-you have gotta be kidding me..." Beau said.
"Oh hey look! I stunned Beau, where's my prize?" Everyone was quiet. "What? To far? Oh well, hey Monokuma, let's get this over with, kay?"
"Your wish is my command!"
"Wa-wait!" Serenade objected.
"Nope! No more breaks! It's time for the main event. I've prepared a very special punishment for the 'Super High School Level Fighter', Punch Out! And now without delay, let's get the ball rolling. It's Punishment Time!!!"