Moonlit Black Cats was a mid-level guild with relatively few members, although all of them, except for Kirito, knew each other offline as the guild was formed from the members of a school's computer club.
On April 8, 2023, Kirito assisted the Moonlit Black Cats when they were being pushed back by monsters in a Labyrinth while their only forward, Tetsuo, had suffered heavy damage and could switch places with anyone. While holding back on fighting the monsters, Kirito led the guild out of the Labyrinth, thus the guild invited him to an ale house to thank him. At the ale house/inn in Taft, the guild toasted for Kirito's help. During their conversation, Keita, the leader of the guild, asked Kirito about his level. Kirito lied about his true level, claiming it to be around the level of the guild members, when in fact his level was two times higher than the one claimed. Since Keita believed that Kirito was around their level and would be soon invited to join a guild, he invited him to join them. Kirito accepted the invitation, but planned to only remain as a temporary member until the guild became strong enough to be independent.
During the next couple of months, Kirito assisted the guild, especially Sachi, who was deeply afraid of death. During the time lapse, the members of the guild had hopes of being strong enough to catch up and join the Clearers on the front lines, and, with Kirito joining them, they believed they stood a chance of catching up.
On June 22, 2023, the guild finally acquired enough money to purchase a home for the guild, thus Keita left to the Town of Beginnings to bargain out for one. The other members then wanted to impress Keita by obtaining items from monsters stronger than them to earn money for a function.
However, while exploring the Labyrinth of the 27th Floor, the guild came across a hidden room with a treasure chest in the middle of it and accidentally triggered a trap which locked the area down and activated an Anti-Crystal Area, with continuously re-spawning monsters (Mineral Elementals and Dark Dwarf Miners) higher than their level soon filling the room. The Moonlit Black Cats were quickly overwhelmed, and all of them were slaughtered, except for Kirito, who survived due to his higher level, but was left distraught. After Kirito informed Keita of the demise of his fellow guild mates, he cursed Kirito's status as a Beater before Keita committed suicide by jumping off the edge of an Aincrad floor.
After the death of his guild mates, Kirito treated a tree growing next to the inn that the guild used as a headquarters as a replacement for a grave for the deceased guild and visited the site every now and then.
Months later, on Christmas Eve, Kirito learned of a revival item, later revealed to be the Divine Stone of Returning Soul, that was dropped by the Christmas event Flag Mob, Nicholas The Renegade, and sought to search for it in hopes to revive Sachi, whom he deeply adored, but was distraught after acquiring the item and finding out that the item could only revive someone within their ten second end-phase, and not someone months ago. Fortunately, just hours later, a time-triggered message record crystal appeared in Kirito's shared inventory with Sachi just as he was about to leave on a suicide run against a Floor Boss. The message Sachi sent told him that she did not blame Kirito for her death, as she believed that her own character would have led to it eventually, thus persuading Kirito to live on.
On October 18, 2024, Kirito was reminded of the deaths of the Moonlit Black Cats when The Army engaged the 74th Floor Boss, The Gleam Eyes, as The Army was unable to use their crystals and were slowly being killed off.
The next day, Kirito was forced into joining the Knights of the Blood guild after losing a duel against Heathcliff. After joining the guild and being asked by Asuna why he had avoided guilds so much even though he was a nice person, Kirito told Asuna about the demise of his former guild, also telling her that he believed that their deaths was his fault and they would still be alive if he had never joined them, thus Asuna comforted him.
On November 7, 2024, after Kirito deduced Heathcliff's true identity as Kayaba Akihiko and was offered to duel him in which Kayaba would free all the players trapped in SAO, the flashback of the deaths of the Moonlit Black Cats occurred again in Kirito's mind, who did not want more people to die.
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|Keita||Guild Leader||Committed suicide on June 22, 2023 after discovering that the majority of the other members had died.|
|Sachi||Damage Dealer||Killed on June 22, 2023 by a group of Granite Elementals and Dark Dwarf Miners in a trap room on the 27th Floor.|
|Tetsuo||Forward||Killed on June 22, 2023 by a group of Granite Elementals and Dark Dwarf Miners in a trap room on the 27th Floor.|
|Sasamaru||Damage Dealer||Killed on June 22, 2023 by a group of Granite Elementals and Dark Dwarf Miners in a trap room on the 27th Floor.|
|Ducker||Thief (treasure hunter)|