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Have you noticed that the two post-credits scenes in Bucchigiri?! are similar? It may be obvious, but it is no coincidence, both are moments between friends, TWO FRIENDS, sharing a very personal moment together. Here we can appreciate some things regarding both friendships, they show trust, loyalty, sincerity and above all, equality. We could say that it's the type of relationship that Arajin and Matakara should share at this point if they hadn't separated, or in any case, if they had reconciled in a healthy way.
Arajin was so engrossed in how it made him feel to have abandoned his best friend and at the same time betrayed the foundations on which their friendship was based (the principles of a honki person) that he never asked himself how his friend felt about it. Deep down he worries about Matakara, to the point that just remembering what he did to him causes him physical discomfort. Wanting to push him away is not because he no longer cares, but rather an instinctive response of rejection of a trigger related to his trauma.
Matakara, for his part, has his own problems. The story has shown us that he always had a dependence on his brother as he was his only close relative, or at least the one he trusted the most. Then comes Arajin, the only person besides his brother that he allows himself to trust. During that time, Matakara puts Arajin on a pedestal, being (surely) his first true friend and first significant connection outside of his family, but eventually the incident we all know happens and Arajin abandons him. Matakara was most likely so heartbroken that he preferred to blame himself for what happened, reinforcing his feelings of inferiority, dependence on his brother and creating a (perhaps) subconscious fear of trusting other people again (something confirmed by Zabu's face during episode 10, surely realizing that he really didn't know his friend as much as he thought), while at the same time, Arajin's memory becomes more and more mythologized, which only gets worse in the fight between Arajin and Marito, which only confirms his own blindness, making the moment of confession much more painful for him.
Obviously neither of them was psychologically prepared for their reunion, because neither had the tools to open up about what happened, and when Arajin decides to do so, he doesn't do it with the intention of taking that necessary first step towards reconciliation, but rather as a way of distancing himself from the source of his trauma, at the worst moment and in the most hurtful way possible, totally blind to Matakara's suffering, who, seeing himself completely deprived of any support, begins his descent into the abyss.
Many talk about how Arajin must open up and allow himself to be vulnerable in order to save Matakara and reconcile, but that also applies to Matakara, who if we look at it, has strongly refused to do so. Although his friends in Minato Kai worry about him, his first reaction after his brother's incident is to isolate himself. He has always been someone strong, honest and reliable, he is that friend you trust in difficult times, not only because he is like that, but because it's what he feels is expected of him and what he demands of himsel. To be able to be like the Arajin he remembers, for his brother who believes he can become the honki person he wants to be, because he is the younger brother of the legendary former leader of Minato kai. All of this has created an enormous weight on him, which surely helped the shadows that stalked him to remain close to him, even when he seemed to be more stable.
This is where we return to the topic of the other two friendships., Marito and Outa for example. In Siguma, their positions as leader and second in command are clear, however, it's more than evident that between the two there is a relationship of equals, where we can appreciate a complete and unquestionable loyalty towards each other, having a fairly strong and solid bond. Kenichiro and Mitsukuni seem to have a similar relationship, the way in which the second one shares his future plans goes beyond a simple conversation between a leader and his successor, but between two people who understand and respect each other. Both are relationships where, although they do not say it explicitly, share great affection, which is what Arajin and Matakara should aspire to in the future. A friendship founded not on the childhood desire to become a honki person, but on the mutual appreciation and affection that they share.