Kyle Klim also know as K is a major character in Virtue's Last Reward
K awakens in the Floor A warehouse in an Ambidex Room with an unconscious Clover. Eventually, K solves the puzzle and exits the room with Clover. Unfortunately, K has lost all memory of his past, but does retain some educational knowledge. Luna states that he has generalized amnesia, which Dio believes is a lie. Regardless of his current state, he decides to go by the name of K and plays through the Nonary Game in hopes of recovering more memories.
On most routes, K actually does play the Nonary Game. After Sigma and Phi jump back in time to save Akane from Dio, Akane takes K out of his suit and places him into a Treatment Pod in the B. Garden and puts him in cold sleep. Akane then dons his armor and proceeds to play the Nonary Game on the cyan door routes. K's generalized amnesia was due to Akane giving him a large dosage of Soporil. Akane also reveals that his real name is Kyle Klim.
In K's ending, K's suit is worn by Kyle Klim and Akane is murdered by Dio and the leftmost AB room is moved. K first goes to the infirmary with Alice and Clover. When Akane is found dead by Sigma and Phi, Dio accuses him of killing her because he woke up in the AB room she was found in. In the first round of the AB game, K betrays Alice and raises his BP to 6. For the second round, he is a magenta solo. After Zero III finishes explaining the rules, K heads to the infirmary and runs into Phi, Quark, and Sigma. K claims not to know who Akane is because of memory loss. He asks Sigma and Phi to look at his armor and they find a lock on the back of his mask. Sigma and Phi deduce that a key can open his armor. K then explains how the armor does not feel strange and that he might have always had it. Soon, the Chromatic doors open and arguments break out on who will go with who. This all ends when Quark suddenly collapses. He says that they should all give up and die. Tenmyouji who is paired with Quark asks someone to pick a door. Luna asks Sigma to choose in which he chooses to go with K. Alice, K, and Sigma head to the Rec Room and solve the puzzle there. They end up in the Floor B warehouse and find three white chromatic doors. Before heading back, K gets a mysterious deja vu about the room, Alice says it probably reminds him of the Floor A Warehouse.
Soon an announcement rings out that an AB room had opened. They run back to find Phi, Dio, and Clover waiting there. Dio admits to opening the gate early, but Clover is more interested in what is in his pocket. She finds a bottle of neostigmine from the Treatment Center. Dio takes it from her but Tenmyouji and Luna arrive saying Quark is missing. They all split up to search for him, K meets up with Sigma in the Rec Room and they head back together saying they couldn't find him. Tenmyouji starts to get worried but Dio soon arrives saying that Alice and Luna are dead and that he found them in the Crew Quarters. Phi says that Dio might have killed them and pretended to find them. Dio plays the blame game on Tenmyouji saying that Luna would be playing against him in the AB game and that he killed her to get more points in the upcoming round. Tenmyouji then accuses K of killing Alice and attempting to kill Sigma, but killed Luna instead. Phi takes their bracelets and everyone heads back to Warehouse A to play the AB game.
Before beginning, K asks Sigma to vote ally saying he betrayed Alice in the first round to get rid of his risk. He then votes betray hoping he could escape but Sigma sees through his trick and votes betray. At the end of round 2, Quark's BP is 9 thanks to Tenmyouji choosing betray. K suggests finding him should be their top priority. K then discovers he is a magenta pair with Phi. They will have to go through a white door with Dio. After Tenmyouji, Clover, Sigma, and K refuse to go with Dio, Phi agrees to search with him. Sigma and K then search the infirmary for Quark and learn that Akane was supposed to be a player because she had a bracelet when she died. K remembers the Luminol would be able to tell which bracelet has blood on it. They decide to move on to Floor B. They search the Green door and find two unlocked doors. K takes the rightmost door with Sigma and end up in the Gaulem Bay.
There, K finds the key to his armor there but doesn't tell Sigma. They next head to the Treatment Center and find Quark sleeping in one of the pods there. They are shocked to see his bracelet gone but he is not dead. K believes Zero removed the bracelet and that Quark is in the pod because he is sick. They then head back to Warehouse B and find Dio and Phi waiting there. They tell them about what they found in the Treatment Center. However Clover and Tenmyouji do not show up. Sigma then leads them to the Rec Room to check their bracelets for blood. Sigma quickly turns off the lights in the Rec Room and sprays Phi and Dio's arms with Luminol. However, Dio refuses to show them his bracelet and tries to run off. He is stopped by K and reveals that Dio's bracelet is glowing. Dio then admits to killing Akane Kurashiki and stealing her bracelet. He however says he did not kill Alice and Luna. Sigma decides to lock Dio in one of the treatment pods until the Chromatic Doors open. After seeing to that, Sigma, Phi, and K head back to Warehouse B. They don't find Clover and Tenmyouji there so they go to floor A to find them. Phi stays on Floor B to search for them.
Upon arriving at the Lounge, K suddenly says he remembers his father. He explains to Sigma his life on Rhizome 9 and about his father's project. Soon after, K decides to lie down on the sofa and Sigma continues searching for them. K then takes off his armor and heads down to the Treatment Center to kill Dio. He turns the oxygen off in Dio's pod, killing him. He returns back to the Lounge. He is then woken up by Sigma and Phi saying that someone killed Dio. They realize the Chromatic doors will open soon and K gives Sigma, Alice and Luna's bracelets. K then leaves to retrieve Dio's bracelet.