Hypocritical Perfectionism

This is Chapter 1 of the story of 404 MARI.
In 1996, in the first multiverse of OMORI... The town of FARAWAY was preparing for a small celebration. MARI and HERO were in love and MARI's younger brother was SUNNY.
MARI had a congenital problem, so she had about 15 years left to live. She always sat on a mat when she went on a picnic. But, hiding her sadness, she was preparing for the upcoming festival and engagement ceremony with HERO. She begins to obsess over 'the happiest moments of her short life', which leads to a feud between Sunny and Mari.
SUNNY and MARI decided to play DUET at the festival and started practicing with each other. kel and HERO were preparing to start a lemonade business, and AUBREY was happy and waiting for the moment.
BASIL took photos of friends to record all of them as memories, and started printing photos one by one and inserting them into photo albums.
They are having a happy moment.
Let's talk about the past. It wasn't like these happy friends were forming a group from the start. After the families of SUNNY and MARI moved to FARAWAY, they became close with the families of KEL and HERO, and then met BASIL by chance. After that, BASIL introduced the crying loner AUBREY to his friends. This is how 'the most perfect group in the world' was born.
MARI prepared a concert with SUNNY. However, MARI's inner obsession and perfectionism began to penetrate SUNNY's mistakes one by one like an arrow, and MARI encouraged SUNNY not to make mistakes. However, Mari's mental state continued to deteriorate, and she eventually started abusing and swearing at SUNNY. In the end, an angry SUNNY threw the violin down the stairs, and MARI was enraged and fell down while fighting with SUNNY.
After 'the incident', SUNNY panics. Eventually, SUNNY and BASIL come up with a plan to fake suicide by hanging MARI's body from a tree and put it into practice.
While hanging MARI, BASIL saw evil teeth and blue eyes, but thought it was a hallucination, and SUNNY later felt that someone was watching from the roof. SUNNY momentarily looked towards the roof with BASIL, and for a moment they saw an evil winged black angelic being. But he disappeared with a mechanical sound, and by the time the evil being disappeared, MARI had already been hanged from the tree.
Also, on the way back home, they briefly had a terrifying vision of MARI.
This incident threw the entire village into a panic, and the story of the 'evil-toothed black angel' that many people claimed to have seen in the village, the story of MARI, and the suicide rumors of the angel and MARI began to spread. HERO entered and stowed away in the house, kel found a new friend, and BASIL became the target of bullying by AUBREY.
Four years later, SUNNY became able to see MARI's spirit, and SUNNY tried actions such as holding a knife or talking to MARI's ghost, but the ghost did not do anything. Then the doorbell rings and KEL comes to visit. After kel told SUNNY that he wanted to play one last time, he grabbed his arm and went outside. KEL and SUNNY found AUBREY while wandering around the park.
AUBREY was harassing BASIL, and AUBREY acted violently, such as stepping on BASIL's face and spitting on it.
KEL and SUNNY started to stop AUBREY, and AUBREY, who was embarrassed to see SUNNY, was caught off guard. SUNNY gets stabbed in the stomach with a knife.
Afterwards, KEL pulled SUNNY's knife, and AUBREY ended up in the hospital. BASIL was abandoned.
That night
Basil suddenly remembered the shotgun in the closet at home, and a way to break the 'vicious circle' came to his mind. He did just that, and two gunshots rang out in the hospital.
By the time everyone arrived at the hospital. AUBREY had knife cuts across her chest, a hole in her forehead, one eyeball stained red with blood, and shards of brain spread out. Basil was lying next to him, holding a knife beside him, with a hole in his chest wide enough to let the air through. The hospital room was covered in blood were around.
SUNNY fainted on the spot and started denying everything. He wanted to become one with OMORI. I wanted to forget everything and live in an eternal dream. But MARI's ghost wanted SUNNY to move on, so she attempted to dimension-shift to give advice in SUNNY's dreams.
But the place where MARI opened her eyes was a true white space with nothing, and she called it 'ANTI-VOID' to suit the characteristics of this place. But she couldn't find a way out of there, and she went mad, and madder. While going mad, she discovered a crack in the code in the void, and MARI saw the possibility of attempting a hack. She tried hacking to get back. However, MARI, who had no hacking knowledge, messed with the code and became a skeleton. She despaired, and after that, MARI, who had gone mad, became an error again, and VIRUS!404 was born. VIRUS!404 transformed MARI's self and gave MARI a different idea. All of the multiverse and all the knowledge of the higher dimensions came to 404, and 404 realized that he was now a god.
After 404 emerged from the void, it easily overpowered many powerful beings. He was untouched by 3D beings at all, and he also proved that 3D infinity was inferior to his own random thoughts. He realized that even the beings of the 4..5..6..7..8..9..10..11 dimensions beyond the 3rd dimension could not harm him at all, and 404 called it 'M-Theory'. I did. However, the 11th dimension was also too low for 404, and he destroyed even the place where he treated the Aleph hierarchy and the place that transcended the concept of dimension as fiction. Also, he won the battle against the being called 'Chaos', which has overwhelming power in the infinite hierarchy of existence.