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Here's a quick explanation of Kunieda:
His character was kind of like, a side character who didn't gain much attention until the end. He almost never spoke except when they were discussing who stole Kase's wallet, and he said "there was no reason to look through people's bags". And he seemed to be obsessed with sex.
His backstory is this:
His real name is Murata. He is also a doctor and went to a medical college with a person named Tooru who became his best friend and he used to play video games with. (We see this in the beginning of Volume 6 I think)
Some years prior to the current story and the Northern Alps Traversal, he pushed his best friend Tooru and a girl named Eriko off a knife ridge (A really thin ridge that's like the width of a balance beam.) which killed them both. It seems that he thought his best friend and the girl Eriko were having a love affair behind his back and "making fun of him". He had fallen in love with Eriko and apparantly he became paranoid and obsessed with the fact that they had betrayed him or something of that air, and that the people he trusted the most, he couldn't trust anymore.
After this event, Murata was plagued with guilt over what he'd done. But still, he ran away from his crime and since it took place on a mountain with no witnesses besides him, the police had no evidence to make an arrest. However, it would seem he really did do it, and Kiriya, the old man who was Tooru's father, went after him to try to get him to tell the truth and find out what really happened to his son.
In order to escape the old man, Kiriya, Murata changed his identity multiple times and changed addresses. He supposedly had been ambushed by him at some point, with the guy waiting at his apartment. Kiriya never gave up and kept trying to find him, almost catching him several times, supposedly.
This made Murata start to get psychotic. And even though he was considered one of the best climbers in the country somehow, he was plagued by guilt and the idea that he would get caught. He also tried to rationalize it to himself saying "well it was their fault for doing that to me, that jackass and that slut". He was running away from his crime and his past, basically. It got so bad that at some point he started hallucinating that Kiriya was following him on the mountain. Niimi figures this out with the few phrases Kunieda said about it right before he died, and how it said "Murata" on stuff in his bag (We see this in some chapter. It's written in romaji originally anyhow, so someone might spot it.) He asked Mori not to tell anyone because Kunieda/Murata really was a good guy, just couldn't confess to what he'd done and it seemed he'd done it on impulse in a fit of jealous rage. He even always kept a photo of him, Tooru, and Eriko in his bag and kept it dear to him, never letting anyone look in his bag on the chance they'd see it. Kiriya, seeing Murata died in the newspaper article, came to Mori to try to get information. Mori respected Niimi and Murata's wishes by saying he didn't know anything, though actually Niimi had told him and he did know. Kiriya leaves basically with just seeing the picture, implying that Murata missed his friends and was sorry, really. Kiriya didn't understand that, though.