Sword Art Online: Infinity Moment simulates a virtual reality massively multiplayer online role-playing game (VRMMORPG) Sword Art Online. The player controls the on-screen player character, Kirito, from a third-person perspective. Within the game, players explore monster-infested fields and dungeons.
Players can attack monsters in real time. The player only directly controls Kirito, while the other characters are controlled by artificial intelligence. Players can issue a simple command to AI controlled characters (recover, defend, switch, etc.). Sufficient SP is required to use skills. Kirito will gain small amount of SP from each attack landed on target and large amount of SP from a successfully parry.
When a boss room is found, after fulfilling all the requirements, the player can initiate a boss raid and a party of up to eight people will be formed (Kirito, his partner, and other candidates from other guilds).
In street area of the 76th Floor, Arc Sophia, the character's hometown in the game, player may restock on items, customize their appearance, buy equipment, or chat with other players. The player may also undertake optional quests.
The story is set in floors 76-100 of Aincrad. The content of these floors were designed specifically for this game (and differ from their presentation in other media such as Sword Art Online: Integral Factor or Sword Art Online The Movie -Ordinal Scale-). Each floor (with the exception of floor 100) has a main town, one or more outside areas, one or more dungeons, and a labyrinth.
Infinity Moment starts at the point where Kirito and Heathcliff were fighting against each other to the death. The plot splits from the canon storyline at this point: as Heathcliff moved to finish off Kirito, a huge glitch virus in the SAO Server occurred and interrupted them, preventing Heathcliff from moving and allowing Kirito to defeat him. However, Kirito and his friends realized that the SAO server was still keeping them in the game for some reason, preventing them from logging out, and also realized that the real battle was on the 100th Floor of Aincrad. The glitch virus in the SAO server apparently wanted to take over the last 25 floors of Aincrad.
Everyone then decided to proceed to the 76th Floor. Many irregular phenomenons happened one after another, such as earthquakes, the corruption of all skills and items data, etc. They also found out that the Teleport Gate could not bring them down to Floor 75 or any other lower floors anymore.
Shortly after arriving on the 76th Floor, Yui appeared from Kirito's inventory and informed her so-called parents (Kirito and Asuna) that the Cardinal System was glitched and therefore no longer had the power to delete her. Later, Lisbeth and Silica arrived with the concern for their friends and, after being informed that they can no longer head back down to the previous floors, try to do everything in their power to help Kirito.
After the defeat of the Ghastlygaze, the 76th Floor Boss, Kirito met Leafa, who turned out to be his younger adoptive sister/cousin. She told Kirito that some kind of error had sent her here while she was playing ALfheim Online. Right after that, Kirito met Sinon, who mysteriously fell from the sky of Aincrad and suffered from memory loss. It was later revealed that Leafa likely entered SAO because she had tried to log into it by using a NerveGear while Sinon encountered a glitch while testing the Medicuboid before she fell into SAO, which, according to Yui, might have been one of the errors caused by the overload of Cardinal System which resulted in the system incorrectly recognizing NerveGear ports as SAO player.
On his way back from a dungeon on Floor 80, Kirito meets Strea, a cheerful girl who has been following him around since Floor 79. At first, Kirito is wary of her, but as they spend some time together, he begins to consider her as an important friend. Strea is always found being alone, like a solo player. From time to time, Kirito finds her acting strange, saying "I must protect this world so that it won't disappear" and having a headache as they advance to a higher Floor.
There is a new group of strong players who wanted to join the Clearing forces on Floor 85. Kirito notices that something is wrong with them and decides to test their abilities. He has a duel with their leader, Alberich. Alberich is indeed powerful, probably has higher status and stronger equipment than Kirito. However, he doesn't have any skill or combat experience. Therefore, he is beaten by Kirito and is rejected to join the clearing group. After being rejected, the group is continually found causing troubles for other players. They can eventually bypass some rules of the game. For example, they can sexually harass other female players.
Before the fight with the 90th Floor boss, upon entering the boss room, Strea has a headache again. Kirito decides to finish the boss as soon as he can and rushes over to see her condition. Strea's personality suddenly changes. She faces Kirito saying she won't allow him to clear the game and she disappears from the scene. Start from Floor 92, Strea is found powering up the boss before the fight and disappears before Kirito could have a conversation with her.
Another strange incident occurs. Players are disappearing mysteriously. On Floor 97, on his way to the dungeon, Kirito hears Klein's scream. He finds Klein, Alberich, and another player lying on the ground. Klein demands Alberich to put away the weapon, a dubious design knife in his hand. Alberich refuses to do so and uses the weapon to stab the lying player's body, causing him to disappear. Kirito can not let this go and request another duel with him. This time Alberich's status is very high, far higher than Kirito. However, Kirito proves to him that high status alone can not beat him. Alberich escapes after his defeat, but later his subordinate is captured by Kirito and Klein and Kirito interrogates him. The subordinate then leads Kirito to where the disappeared players are sent to. Kirito finds what seems to be a research on peoples' feelings and a research record. He notices that the days written in this record are the same days when Strea has a headache. Kirito recalls that when he first met Yui, she had broken down because of players' negative feelings. He believes there is a connection between Yui and Strea, therefore he decides to destroy all the research data.
After defeating the 98th Floor's boss, Alberich appears before Kirito again. He tells Kirito about his scheme, a research on the manipulation of the human soul. His identity is also revealed to be Sugou Nobuyuki, who works for RECT Progress. Alberich also explains that he has high level stats and strong equipment due to using a super account. Alberich intends to kill everyone who is in his way and he starts by paralyzing all the players and summoning Hollow Avatar, the 100th Floor's boss, to assist him. However, Kirito breaks free from his paralysis status and defeats the boss. But, before he could reach Alberich, he is paralyzed again and Alberich takes out a special blade that holds an incurable poison, which would gradually but inevitably reduce the target's hit points to zero. However, this attempt is negated by Strea, who took the attack for Kirito and removed Alberich's super account privileges before being forcibly fused with the Hollow Avatar and disappearing. Vowing to rescue her, Kirito and the group agree to save Strea by reaching the 100th Floor.
After defeating the Hollow Avatar in the Ruby Palace, Strea appeared in a large monstrous form and attempted to eliminate the Clearing group. Her defeat led to Aincrad being cleared and her temporary freedom. Strea slowly disappeared as her fusion with the Hollow Avatar had revealed her true identity as a mental-health care program in the game, and led to her returning to her true form. At the last minute, Yui absorbed Strea's program and assured the rest of the group that she was still alive.
Heathcliff reappeared shortly afterwards to congratulate the group for making it all the way to the end. Apologizing for his sudden disappearance and return, he explained that the accumulation of negative emotions from players' distress had overwhelmed Strea's program, resulting in a catastrophic error that infected the core of the Cardinal System. At the same time, outside interference from Sugou Nobuyuki and his associates had forced the system to assign most of its capacity to handle the new problem. Together, these two challenges had caused parts of Cardinal to malfunction and begin operating independently, triggering a system error that interrupted the duel. As the system reached a level of emergency, Heathcliff had been automatically reassigned to an administrative role. Due to being too preoccupied with mending the situation, he had been unable to inform the players of what had occurred.
Admitting that things did not always go according to plan in worlds where human engagement was deep, Heathcliff declared that all the players had earned the right to leave Sword Art Online due to their defeat of the 100th Floor Boss. Listening to Kirito's outrage at the deviation in plans for the final boss fight, he accepted the Black Swordsman's demand to log everyone else out of the game, before resuming their duel. Impressed when the other players refused to leave and instead chose to fight with Kirito, Heathcliff wondered if he had created Sword Art Online to see people unite for a common cause.
After his defeat, Heathcliff commended the players for their triumph over him, confirming his intention to keep his promise to return them to the real world. When the Black Swordsman questioned him on his own status, Heathcliff revealed he would have to remain in Aincrad to abide by his own rules. Voicing his gratitude to the other players for contributing to his vision, he bid them farewell, before vanishing.
The game has many different endings. The ending that the player gets depends on the characters the player teams up with before the final battle. Particular character side story plots need to be completed to open up the character's team up option.
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