the following theory was written by "mai x" (we meet again):

"One Interpretation: Futa had little to no real-life friends and mainly used the internet to socialise. When he and other netizens criticised a cyberbully, he enjoyed the feeling of justice being served, the attention he received and the sense of comradery which arose from it. As a result, he sought out another person to attack. Futa spotted a professor at his university with a woman, who appeared to be in a state of discomfort. He took a picture of them and uploaded it, claiming that the professor was committing s-xual harassment. With Futa leading the group, the professor was flamed a lot more harshly. His final victim was likely a wealthy guy, who did little to no wrong in actuality, but Futa flamed him nonetheless. This time, it was solely Futa’s doing. His few supporters don’t join in but view it as entertainment. Futa’s words and the doxing pushed the guy over the edge, and he eventually took his own life; this caused Futa’s remaining followers to abandon him. In the end, the netizens realised that Futa had become a cyberbully himself, and, consequently, they criticised and doxed him back. [Edit:The first guy was likely pulling a social media stunt and was an Internet troll. His final victim was a middle school girl]

The fire motif is a likely reference to flaming, referred to as 「炎上」in Japanese. The first kanji is composed of two fire radicals.
The monochrome colour scheme present at some points in the MV displays his binary thinking. In Japan, 「白黒」[white and black] represents good and evil respectively. His mindset takes this further and categorises people as either allies or enemies.

0:00 The MV opens with Futa staring at his phone. The conversation topics are ordinary. Someone complains about having to do an assignment. Another asks if there’s a fun game to play. The final comment states that nothing interesting had been happening and that things were getting boring. These are likely his internet friends.

0:37 The sides of the arcade game turn from white to grey to black; this foreshadows how his morals worsen as the MV unfolds.

0:47 He stares at the group of three guys. He’s likely envious of the bond they share. In the segments where we see Futa in the real world, he’s always alone. When he looks down at his phone, he pulls back his mask to reveal a smile. The user ice_gorilla_ice appears to be cyberbullying someone.

1:08 ice_gorilla_ice is represented by the ice monster they fight. In this first fight, Futa plays a minor role. He fights alongside the public against the cyberbully and uses a small dagger, which implies that the insults were far tamer than the ones he uses later on. The number of hits may indicate how much emotional damage was inflicted on the person. In this case, it’s a low number, but it drastically increases for the latter two in the MV. The monster was stunned, not killed, implying that ice_gorilla_ice was still able to metaphorically and literally get back up on his feet. Everyone rejoices. All of this might suggest that the first case was more of a ‘call-out’ rather than ill-intentioned flaming. ice_gorilla_ice also seemingly hadn't given out his real name, so it was his online persona which was attacked. There’s a chance for him to start over.

1:30 Futa sees his professor and the woman and assumes that he’s harassing her. So, he secretly takes a picture to upload it online.

This case seemingly shows how Futa cares little for the victims of what he deems to be injustice, and his real motive is to punish others so that he can elevate himself. His sadistic nature is highlighted in two lines: “What I want to hear is the scream deep inside you” and “We’re gonna punish you until you cry.”

The woman appears uncomfortable, however, the situation is ambiguous. There’s little definitive proof that the professor had malicious intent or that it was even s-xual harassment in the first place. We, and therefore Futa, also can’t hear the conversation taking place. Taking into consideration his binary thinking style, he likely made various assumptions with the sparse context available and likely made exaggerations to paint the picture he wanted—implied by how the real scene taking place becomes distorted.

The reasonable thing to do would be to confront the professor to avoid a misunderstanding of the situation. In case that the professor did have ill intentions, he could potentially use the photo to leverage against him. The next option would be to inform someone else. We can see that there are other people closeby, so if he feared facing the professor alone, he could’ve asked for help. Yet, he sneaks away to upload the photo.

Hypothetically speaking, if the woman was indeed being harassed, Futa essentially deserted her. He’s not acting in her interest, but his. The post is also worded in an insensitive manner. 「拡散希望、大学教授のセクハラシーン。見られてると思わなかったんだなw 大学に通報よろ」It roughly translates to [Spread the message/Please RT. This is a photo of a university professor committing s-xual harassment. He probably didn't think he'd be seen lol. Report him to the university. Thanks.] This is likely a violation of the woman’s privacy, especially since she had no prior knowledge of the picture (盗撮 indicates no consent was given when taking it). She also hadn’t permitted him to upload the photo onto the internet.

1:56 Notice how the background has changed from black with coloured squiggles to a monochrome version of this pattern. His binary way of thinking is now in full force.

2:07 He switches from the dagger to the sword, implying that he wishes to do more damage to the professor than the previous cyberbully. Futa is leading the attack, but his followers are close behind him. There are fewer people than in the last case. The decrease is likely because of the little evidence Futa presented, but he deems them as non-believers of justice instead; this is implied by the earlier line “If you get off now, you’re a traitor”, which ties in with his binary friend-or-foe mindset. There are two Xs, which suggests that the professor suffered far more serious consequences, e.g. destruction of reputation, difficulty in career prospects, etc.

2:39 Unlike the previous two cases, we’re not shown an incident which Futa’s target has caused before the gamification of the setting and the announcement of the target. The only thing we see beforehand is a large house. This suggests that Futa had little reason to harass the said person. Either the incident was so minor that to the point where he can’t remember why he cyberbullied them, and/or he envied the person’s wealth instead.

3:07 Futa takes the lead and his handful of followers just watch him. This might imply that Futa’s remaining allies viewed his acts towards the final person as a spectacle, and didn’t partake in it themselves."

 

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